Sealing & resealing bags

Buy from an extensive range of sealable and resealable bags, including grip seal bags, zip seal bags and self-seal bags.

Sealing and resealing bags are...

• Reusable polythene bags that can be opened and closed
• Designed for multiple use - open and close as many time as you like!
• Bags that can be sealed by a variety of means, including self-seal bags

Self-seal bags are...

• Manufactured with an integral sealing strip, located along the bag opening, to allow for easy opening and closure
• Also known as minigrip bags, mini-grip bags, gripper bags, grippa bags and resealable bags
• Ideal for securing bag contents and avoiding leakage or contamination
• Available in a variety styles to suit a range of uses, from storage bags to carrier bags
• Available in clear polythene with or without labels - to make a note of bag contents and help retrieval
• Available in variety of coloured opaque polythene - e.g. red, green, blue or black - to help with item storage and colour-coded retrieval
• Also available in more specialist polythene, from heavy duty grip seal bags to anti-static grip seal bags
• Sometimes referred to as zip seal bags. However…

Popular views on mail bags

Large mail bags need to be specified for rough handling, not only for nominal capacity. A bag that sees sound on paper can still fail if the closure is weak, the film or woven structure is also slick, or the load settles into sharp pressure points amid transit. That is why superb designs focus on seam strength, proper gauge, and enough body to retain their shape on a pallet without wasting material. In practice, the optimal option is the one that stays stable below vibration, retains contents contained, and avoids handling damage when moved fast through a busy dispatch area.

White mail bags work on control rather than cushioning, so the film specification has to be proper from the beginning. A superb bag relies on proper gauge, enough dart resistance to cope with rough handling, and a seal layer that closes cleanly on fast packing lines without wandering into weak spots or sticky edges. The white stop is not only for appearance either, because it often comes from a co-extruded polythene suppliers structure that assists with opacity and gives a smoother feed through bagging equipment. When those properties are balanced properly, the result is a lighter pack that handles fast despatch without wasting space or causing seal failures.

Postal bags are often chosen for soft products because they retain postage light and take up small space in storage, nevertheless the bag still has to suit the item inside. Collars and leads can have sharp fittings, so the film and seal need enough strength to avoid splits amid picking, packing, and delivery sorting. A thin bag may see efficient on paper, yet handling damage soon wipes out any saving if the contents arrive exposed or scuffed. Good secondary packing also assists staff work faster, since consistent sizes stack better in cartons and transport cleanly through dispatch. The proper mailing bag makes the all line easier to manage, not only cheaper to mail.

Kraft mailing bags

A mailing bag with built-in padding gives better protection for light, delicate products than a plain paper mailer. The kraft outer face retains handling tidy in the warehouse and on the doorstep, while the inner padding assists absorb knocks that would otherwise label jewellery, cosmetics, or stationery. Choosing the proper size matters because a bag that is also big lets the contents transport about, and one that is also tight can stress the seal. Stocking small, medium, and big sizes also assists select-face efficiency and cuts waste from overfilling. That makes the pack more proper for daily despatch.

Printed Mailing Bags

Printed mailing bags need to be chosen for how they dash, not only how they see on a screen or sample card. A simple flexo print can suit bold branding because it puts solid colour on polythene suppliers without upsetting the film, while more detailed artwork often requirements tighter control of ink stickiness and register so the image stays sharp in fast packing. Film slip matters as well, since a bag that glides well on the line can improve select-face efficiency, yet also much slipperiness can make sealing and stacking awkward. The optimal specification balances print quality with handling performance, so the bag works cleanly through the packing operation rather than causing delays.

The history of the padded envelopes – Who invented Jiffy Bags?

What the trade still calls jiffy bags work optimal when the pack has enough give to absorb knocks without letting the product take the blow. A mailer that sees light on paper can fail on the bench if the padding collapses below pressure or the seal opens amid bagging and sorting, because the all point is to keep safe small products without adding unnecessary tare weight. Construction determines how well that happens, from paper-based cushioning to film structures that retain their shape and resist scuffing in transit. The proper selection retains parcels moving cleanly through packing and dispatch, rather than creating avoidable returns and damage claims.

Design Poly Mailers polythene suppliers Mailing Bags Biodegradable Mailing Bags Custom Mailer Bag

Biodegradable mailing bags only work properly when the material is matched to the job and stored with care. A mailer that sees tidy on a specification sheet can still let a package down if the film is also thin, the seal strip is weak, or the bag softens in hot conditions amid dispatch. Good packers see at gauge, tear resistance, and closing performance together, because a bag that splits in transit creates handling damage and additional waste. For lighter clothing and soft products, a well-manufactured biodegradable polythene suppliers mailer can give decent protection and retain packing lines moving at speed. The practical test is whether the bag survives the journey without forcing a re-pack or a client complaint.

Baby Blue Mailing Bags

Blue mailing bags give a simple, proper outer skin for products that need to reach the client clean and dry. The opaque polythene suppliers conceals the contents, while the waterproof surface assists keep safe against rain, damp yards and rough handling in transit. A 55 micron gauge gives more body than thin film, so the bag is less likely to split at the seams or crease badly when filled with folded clothing, lightweight boxes or printed matter. A light blue stop also makes the consignment easy to spot in sorting areas, which can assist avoid select-up errours and speed dispatch. They are a practical selection when presentation, protection and basic stock handling all matter together.

Pink mailing bags are chosen for fast despatch work where light weight, privacy and a clean appearance all matter at once. A decent bag in the proper gauge retains clothing, soft products and non-fragile items protected without adding much carriage weight, and the self-seal strip speeds up packing on a busy line. Colour can also assist with sorting, since a distinctive stop makes it easier to spot the proper consignment on a crowded dispatch bench or in storage. If the film is also thin, though, stretch and puncture risk rise fast, so the specification has to match the handling route rather than only the see.

Download Two Metallic Mailing Bags Mockup Front View Yellowimages

Metallic mailing bags need to do above see clever, because the proper test is how they behave through packing, despatch and delivery. The better versions are normally multilayer polythene suppliers with a metallised or vapour-deposited stop, so the sheen is there without turning the bag into a heavy, awkward item for package handling. That matters on a busy line, where seal quality, film tension and gauge control determine whether a bag feeds cleanly or beginnings causing stoppages. If the material is also soft, it can distort below auto-bagging pressure; if the seal is weak, the result is rework and secondary packing. A sound spec retains the pack stable, travels well and grasps its shape.

Zip seal bags are…

• Manufactured with a metal zip fastener or zip seal, making them…
• A more premium bag than a grip seal bag
• Used for storing important documents, such as art portfolios or school project work
• Ideal for use as a wallet for conference delegates or for exhibition attendees
• Also known as zip bags, ziplite bags or zipper bags

Sealable, resealable and self-sealable - there's more than one way to seal a bag

Sealable bags

Any plastic bag that can be sealed shut can be described as a sealable bag.

The sealing process can be carried out by any means, including a bag tie or clip (e.g. a sandwich bag with a twist tie), an adhesive strip, either external (e.g. sealing any bag with cellotape) or internal (e.g. as with a mailing bag), an internal self-seal strip (e.g. as with a minigrip bag) or by heat sealing with an external sealer (e.g. as with vacuum bags).

So any plastic bag that is designed with a seal can be called a sealable bag. However, not all sealable bags can be called resealable bags.

Resealable bags

Only bags where the seal can be reused can be classified as resealable bags. Some bags, such as mailing bags, feature a single-use seal that can't be reused without tearing open the bag itself and thus rendering it useless. Mailing bags are a very convenient way of sending post - thanks to their integral adhesive seal - but, because their seal is strong enough to keep the mail contents secude until the bag is cut or ripped open by the recipient, then a mailing bag is not a resealable bag, although it is a sealable bag.

Self-seal bags

Not every sealable bag be called a self-seal bag. This monicker is reserved only for bags that can be sealed closed without using any external sealing accessory - including adhesive tape, clips or bag ties - and without the use of a heat sealer to melt the polythene and seal the bag.

The most popular types of resealable bags are grip seal bags. These bags, which are sometimes known as mini-grip bags, gripper bags or grippa bags, feature an integral seal that runs along the top of the bag.

The seal contains a male (single) and female (double) ridge of plastic on opposite sides of the bag opening. When the seal is squeezed gently between thumb and forefinger, the male ridge fits snuggly into the female ridges to close the bag. This seal protects the contents of the bag from moisture, dirt and other external contaminants.

It can be used over and over again, which means the grip seal bag is a sealable bag, a self-seal bag and a resealable bag.

This handy bag is available in a huge range of sizes, made from clear, coloured or black polythene, with or without labels to make handy notes on the bag and with specialist options including antistatic bags - to keep electrical components safe - and specimen bags with accompanying record cards - perfect for hospitals, doctors' surgeries and police stations.

Methods of sealing plastic bags

The most common ways of sealing a polythene bag are by:

Sealing the bag with ties or clips. Fasten any bag shut with a plastic clip or twist shut with a tie. A popular method of sealing food bags for domestic use (e.g. clip a packet of frozen peas shut before placing in freezer, twist a sandwich bag closed for a packed lunch etc.)

Sealing the bag with a built-in adhesive flap. Some bags such as mailing bags are manufactured with a flap opening, where the flap contains a built-in adhesive strip attached along its length. Simply remove the cover from the adhesive and press the flap down to seal.

Sealing the bag with a built-in grip or zip seal. A range of bags are available with an integral strip that seals shut either by squeezing the seal together (grip seal) or pulling closed (zip seal). Very handy for regular use as they can be used over and over, these bags also provide great protection from moisture, dirt etc.

Sealing the bag with a heat sealer. If you really want to seal your bag shut tight this is the method for you. A heat sealer will bond two pieces of plastic when placed together in the sealer and the sealer is closed shut. A one-time seal, this method of sealing bags is popular for vacuum packing food.

Where to buy sealing and resealing bags

Resealable bag manufacturers and suppliers include:

Ziplock Bags
The home of ziplock bags online, this website features everything you need on ziplock, zipper, ziplite, grip seal and all self-seal bags. With a huge range of products at great prices and free delivery within the UK, this is the number one ziplock website out there.
www.ziplockbags.co.uk

Self Seal Bags
Specialists in self-seal bags, this website stocks a huge range of resealable bags from grip seal to mini grip and ziplock to ziplite. Packed with loads of useful information to help you choose the right bag for you, with free delivery to UK addresses.
www.self-seal-bags.co.uk

Plastic Self Seal Bags
Discount Self Seal Bags is the place to go to get resealable plastic bags at discount prices. Also features loads of useful information on self-seal bags, including a handy buying guide to make sure you pick the right sort of resealable bag for you.
www.discountselfsealbags.co.uk

Minigrip Bags
A website loaded with information on minigrip bags - aka grippa bags - and all types of self-sealing bags, with list of the best places to buy them online. Features a useful guide to anti-static self-seal bags, what they are used for and how they work.
www.minigrip-bags.co.uk

Zip Seal Bags
Zip Seal Bags contains loads of great information on zip seal bags and other types of self-seal polythene bags and eco-friendly alternatives. It also features a handy list of online zip seal bag retailers.
www.zipsealbags.co.uk

Antistatic Bags
Antistatic bags is the number one website dedicated to antistatic bags. Containing a wealth of information on antistatic packaging and how it works, along with details of where to buy it at the best possible prices.
www.antistatic-bags.co.uk

Resealable Bags
Resealable-Bags is a division of Polybags Ltd, the UK's number one polythene manufacturer, that specialises in resealable bags. Offering an unrivalled range of resealable bags and other polythene packaging at the best prices online.
www.resealable-bags.co.uk

Advice from the web on mail bags

Large mail bags have to balance capacity, strength and handling in a method that smaller sacks not ever transport out. Once a bag acquires oversised, the occupy pattern beginnings to matter as much as the material itself, because uneven loads push stress into the corners, seams and folds when the bag is lifted, stacked or dragged across a sorting floor. High-density polythene suppliers is often chosen so, as it can take abrasion from tied bundles, repeated flexing and the strange sharp edge without splitting also easily. The proper gauge avoids both weak seams and wasted material, so the bag carries the load without becoming heavy dead weight in the chain.

White mail bags suit fast-moving despatch work because they keep safe light products without slowing the packing line. The pale outer stop stands out clearly on a busy bench, so labels, order details and sorting labels are easier to read, which cuts the chance of mix-ups when staff are handling plenty small consi gnments at once. They work well for CDs, DVDs, documents and flat printed items that need above a paper envelope nevertheless do not need a fat carton. Used properly, the format retains the pack tidy, the bench tidy and the line moving at a sensible pace.

Postal bags need to do above only grasp a brochure or a small product; they have to retain the contents together, clean, and hard to tamper with amid sorting and delivery. A superb bag specification balances strength with material use, because a heavy gauge can keep safe better nevertheless may also add cost and waste, while a thinner film may cut corners if the load is sharp-edged or the mail dash is rough. Print can assist with identification and emblem presence, nevertheless the seal and film quality still determine whether the package survives handling. Getting that balance proper reduces complaints and damaged returns.

UK Packaging is a leading supplier of mailing bags, with a wide spectrum of options to satisfy even the most diverse of mailing operations.

Postal bags need to match the contents properly if parcels are to transport through packing and dispatch without trouble. Off-the-shelf sizes suit plenty jobs, nevertheless awkward items, folded garments, literature packs and mixed consignment mixes often need a alternative fit to stop excess movement and reduce handling damage. A bag that is also big wastes material and can see untidy at the packing bench, while one that is also tight slows the line and puts stress on seals. Special sizes assist maintain packing speed and retain secondary packing simple. The proper specification saves time in despatch and gives a cleaner result when the package reaches the client.

Details about   Floral Printed Mailing Bags Size/Colour/Qt y

Printed mailing bags have to see cheerful without losing the plain toughness needed in dispatch. The floral print may be what catches the eye, nevertheless the bag still relies on the film below it, and that means the proper gauge, decent seal quality and enough puncture resistance to survive sharp corners, tape edges and rough handling on pack benches. If the print and ink laydown are controlled properly, the bags feed more cleanly through packing stations and cause less stoppages from static or sloppy seals. That kind of balance matters because presentation means small if the consignment arrives split or scuffed.

Jiffy bags

Jiffy bags are chosen because they give light parcels a better chance of surviving rough handling without the weight and cube of a small carton. A padded mailer absorbs knocks amid conveyour travel, trolley movement and package sortation, which matters when mixed consignment lines are being packed fast and there is small room for additional filler. The proper trade-off sits in the building: paper-faced padded mailers can be useful for normal dispatch, nevertheless the cushioning layer and adhesive seams need proper control if seal quality and puncture resistance are to grasp up. Where the contents are flat, awkward or easily scuffed, that additional protection is worth above a tidy-looking sleeve.

Biodegradable mailing bags can reduce the burden of soft plastic waste, nevertheless only when the bag type matches the route it is meant to take after use. A mailing bag that smashs down in the gross conditions may see responsible on paper yet still behave like normal film in a busy dispatch room, where strength, print quality and seal integrity matter first. Staff need a bag that runs cleanly through packing, closes properly around mixed contents and survives sorting without split seams or scuffed labels. When the spec is proper, these bags offer a practical method to manage protective outer packaging without adding unnecessary disposal problems.

Blue mailing bags suit light-duty despatch because they retain weight low while still giving parcels a clean, recognisable appearance. A co-extruded three-layer film can transport colour on the outside, a pale middle layer, and a dark inner layer that conceals the contents and assists keep safe against light display-through. The glossy skin also makes labels and postage labels grip properly once the surface has been treated at conversion. That matters on busy packing benches, where poor stickiness leads to rework and delayed parcels. For simple, low-risk mailing work, this type of bag is a tidy fit.

Pink Mailing Bags - Recycled Plastic

Pink mailing bags are chosen as much for handling behaviour as for appearance, because a decent recycled plastic bag has to survive fast packing, rough sorting and the strange sharp corner in transit. The film requirements enough gauge and stretch to grasp its shape without splitting at the seals, while the self-adhesive strip must close cleanly when the bag is filled close to capacity. If the bag is also thin, snagging and split seams soon become a problem on the packing line or in the dispatch cage. A bag that balances strength with flexibility gives better pallet stability and less claims for damaged products.

Metallic mailing bags work optimal when the main aim is secure package handling rather than flashy appearance. A small format like 120 x 160 mm requirements enough puncture resistance to cope with carton corners, blister packs and other awkward contents, yet it still has to stay light enough to retain postage and packing volumes sensible. The peel-and-seal strip does most of the proper work, because failures normally come from dirty stick lines, lifted edges or adhesive losing grip in cool or hot depots. A properly manufactured bag cuts out the need for additional wrap, which saves time on the pack bench and reduces rework later. That sort of simple reliability is what makes the format useful.

Research & Resources

For plenty more information on sealing and resealing bags, including the manufacturing process, types of self-seal bags available and their many uses, please visit:

PlasticBags.uk.com: Browse through a huge range of self seal bags websites or, if you are a manufacturer, list your products for free on this online directory specialising in self seal bags and other plastic packaging.

PackagingKnowledge: The UK packaging industry's number one website contains huge amounts of information and in-depth articles on self seal bags.

Goldstork: This free online directory features specially selected information and hand-picked features on a range of self seal bags and resealable bags.

What is static electricity?

Every object in the world - ourselves included - is made of atoms, which are in turn made of protons, neutrons and electrons. While neutrons have no charge, protons are positively charged and electrons are negatively charged.

In normal circumstances, the number of protons and electrons in an atom balance each other out, meaning that atoms have no charge. However, when two items rub together or separate, the electrons contained within these items can move from atom to atom or even from item to item, thus giving the atoms a positive or negative charge.

If the items involved in this situation are made from a material that does not conduct electricity - an insulator - then this charge can not move. The result is static electricity.

How do antistatic self-seal bags work?

If any static electricity comes into contact with an antistatic self-seal bag, rather than pass through the bag and risk damaging the electrical components inside the bag, the electricity passes around the bag and dissipates before it can make contact with the components, thus removing the possibility of damage.