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

Printed mailing bags need to be chosen for how they behave on the packing line, not only how they see on a shelf. A sharp design is wasted if the film gauge is also light for the contents, because corners, seams and stressed folds are where splits normally beginning. A heavier gauge may feel safer, nevertheless it can make the bag stiffer and harder to close cleanly, which slows packing and creates more waste. Seal quality has the same practical effect, particularly when bags are handled repeatedly, stacked in totes or brushed against cage sides. A bag that stays intact through those stages retains labour tidy and cuts down on returns caused by handling damage.

White jiffy bags stay popular in despatch work because they offer a light mailer that still gives proper protection and handles well on fast packing benches. Their value lies in the balance between weight and strength: a bag must resist knocks, survive rough transport and still close cleanly without the flap lifting or the seal picking up dust. White outer films also expose scuffs, adhesive labels and dirt more clearly than darker grades, so any disadvantage in handling shows up at once. That can be useful, because poor pack-line discipline becomes visible before it turns into complaints or returns.

Details about   eco mailing bags biodegradable mailing bags pack of 100

Biodegradable mailing bags work optimal when the material is chosen for the proper job, not only for the label on the pack. A bag that sees attractive on a web page still has to survive filling, sealing, sorting and delivery without tearing at the seams or splitting around the flap. Gauge, cling and seal quality matter because a weak bag creates handling damage before the package even reaches transport. Pack size also affects stock rotation in dispatch areas, since larger cases are easier to store and count nevertheless can take longer to use through. The proper specification retains packing lines moving and cuts avoidable waste.

Blue Mailing Bags

Blue mailing bags assist despatch teams transport stock fast because the colour makes outgoing parcels easy to spot on a crowded bench. That visual cue speeds up picking and sorting, particularly where small items are being kitted into secondary packing and sent out in mixed consignments. The bags also need a sensible film gauge, since a flimsy bag can split on a conveyour or amid vehicle handling, even when the contents are light. A tidy-looking bag that tears before delivery saves none any time, so practical strength matters above appearance.

Pink mailing bags rely on their layered film build, not only their colour, to keep safe products and retain contents out of sight. A three-layer co-extruded polythene suppliers structure can give the bag a clever pink outer face, a supporting middle layer and a darker inner layer that cuts down on visibility through the film. That building matters on the shop floor because it lets converters balance strength, opacity and weight without making the bag feel wasteful. It also stands up better to scuffing, stretching and the rough handling that happens in sorting and transit, so the finished pack sees tidier when it reaches dispatch.

Download Two Metallic Mailing Bags Mockup Front View Yellowimages

Metallic mailing bags need to be treated as proper transit packaging, not only a clever-looking outer layer. The bag has to survive being filled, sealed, stacked, and moved through despatch without splitting at the corners or scuffing open on rough handling. Film selection makes a proper contrast, because a controlled polythene suppliers structure with decent puncture resistance will normally perform better than a heavier bag with uneven gauge and poor toughness. If the material is badly manufactured, it can cling on the line, attract dust, and slow operatours at the bench. A tidy stop only matters when the bag still reaches the client in one part.

Plastic envelopes work optimal when the material suits the job rather than the sale pitch on the box. A transparent bag or pouch may see simple, nevertheless gauge, stiffness and seal quality determine whether it survives sorting belts, rough handling and the journey through a mail hub. A film that is also thin can split at the corner or around a folded edge, while one that is also heavy costs more and adds waste. The proper specification gives a tidy presentation, protects against moisture and retains contents together without additional outer packing, which makes dispatch cleaner and reduces complaints about damaged products.

Keyword Research: People who searched poly mailers also searched

Poly mailers are optimal used where light weight, low freight cost, and clean presentation matter above heavy-duty protection. A superb mailer retains the pack tight around garments, soft products, and other flexible items, which means less voids in a carton and better select-face efficiency in the dispatch area. The film gauge has to match the product, though, because a thin bag that splits in transit creates more waste than it saves. A well-judged mailer also reduces seal failures and makes packing faster at the bench, so the all operation runs with less handling damage and less returns.

Courier bags need the proper film balance if they are going to keep safe products without becoming awkward in use. A bag that is also thin can split in transit, while one that is also heavy adds cost and waste without giving better protection. For dispatch teams, the proper test is how the bag behaves when packed fast, sealed, and stacked with other consignments. Film selection also affects puncture resistance, print quality, and how neatly the bag feeds through packing lines. When the specification matches the job, handling damage drops and packing runs stay smoother.

Mailorder bags need to behave predictably at the packing bench, because any film that fights the operatour fast drags down output. A bag that opens flat, stays open long enough to load, and feeds cleanly from the stack cuts out additional handling and retains the pace moving when order volumes are climbing. If the polymer is also soft, it can cling and fold back on itself; if it is also stiff, it resists opening and makes sealing slower. Consistent gauge and slip let the line dash at a proper rhythm, which is far better than stopping to proper all awkward bag.

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

A bubble lined mailing bag in size E/2 gives lightweight products a better chance of arriving in saleable condition because the outer mailer and the air-filled lining work together to absorb knocks. For small items like accessories, printed matter or spare parts, that additional cushioning can reduce scuffing without the bulk of a carton, which assists when secondary packing requirements to stay lean. The oyster white face also presents a clean, neutral stop that suits most dispatch operations and makes labelling straightforward. When the contents are not fragile enough to justify a box nevertheless still need more protection than a plain bag, this sort of mailer often strikes the proper balance.

United Kingdom waterproof plastic custom printed mailing bags

Printed mailing bags need to be specified for the method they behave on the packing bench, not only for how they see once they reach the client. A co-extruded polythene suppliers bag with the proper gauge can stand up to sharp carton corners and awkward product shapes without turning into a handling problem for the warehouse team. If the film is also thin, splits and seal failures appear as soon as parcels are dropped, squeezed into cages, or pushed through dispatch. If it is also heavy, the additional stiffness slows folding and counting, and the finished consignment takes more space than the job requirements.

WiktionaryJiffy bags

Jiffy bags stay in use because they solve a handling problem, not because they are familiar. A lightweight mailer can survive automated sorting, minour knocks and mixed consignments without adding much tare weight, which assists retain load plans sensible and reduces wasted space in transit. The proper job is in the building: paper-faced versions need enough caliper, stick strength and puncture resistance to keep safe the contents, nevertheless not so much board-like bulk that pack speeds drop and pallet density suffers. If the structure is also open, the edges scuff and the bag loses shape; if it is overbuilt, the line slows down for no superb reason. The optimal selection is the one that retains protection and efficiency in balance.

Biodegradable mailing bags can work well for light products, nevertheless the material selection requirements careful control if the handle is meant to stay tidy through packing, storage, and delivery. A bag manufactured from a recycled blend may save plastic, yet the gauge still has to suit the product weight, the seal has to grasp below pressure, and the film must not split when sortation equipment or rough handling puts it below strain. Warehouses also need consistent sizing so select-face staff are not fighting awkward pack formats at speed. A bag that sees greener nevertheless fails in transit creates more waste, more returns, and more rework.

Blue Mailing Bags

Blue mailing bags work optimal when the film is robust enough to survive rough handling without adding unnecessary weight to the package. A superb bag relies on consistent polythene suppliers gauge, because thin spots tend to split on carton corners, pallet edges and conveyour guides, while oversised film only adds cost and takes up more room in the dispatch line. Sound seal quality matters also, since weak seams can open amid sorting or travel through package networks. The practical aim is simple: a bag that stays light for postage calculations, resists puncture, and retains the load intact until it reaches the next stage.

Pink Mailing Bags

Pink mailing bags work optimal when the film is thin enough to retain postage and pallet weight below control, nevertheless still robust enough to survive rough handling in sortation and transit. The proper value is not the colour alone; it is the method a well-manufactured polythene suppliers mailer balances gauge, seal quality and puncture resistance so soft products can travel without additional outer packing. That can speed up packing lines, improve select-face efficiency and cut down on secondary wrapping at the bench. A bright shade also makes returns and mixed consignments easier to identify in products-in. When the film spec is proper, the bag does its job without drawing additional labour or material into the process.

Metallic Mailing Bags

Metallic mailing bags work optimal when the film or laminate is controlled at origin rather than left to chance. A proper gauge gives the bag enough strength for sorting, stacking and transit without turning it into an unnecessarily heavy pack that costs more to send. Clean edges, even sealing and a tidy stop also matter on the packing line, because bags that feed smoothly are quicker to occupy and less likely to trap folds or split at the seam. When the material behaves properly, dispatch runs more cleanly and the finished mailer arrives looking as intended.

Jam Paper 9 1/2'' x 12 1/2'' 12pk Plastic Envelopes with Zip Closure, Letter Booklet - Green

Plastic envelopes are a sensible selection when documents need protection from dirt, moisture and rough handling in transit. The proper value lies in the material behaviour: a decent polypropylene or polythene suppliers envelope bends without splitting, so papers stay flat even when packets are squeezed in a bag, cart or archive tray. A zip closure adds proper retention, which matters when items are opened and closed plenty times on a shop floor or at a desk. For bulk supply, the pack format also assists with stock handling because it is easy to count, store and issue without damaging the contents. That makes them a practical secondary pack for paperwork that has to stay clean and organised.

Black Poly Mailers

Black poly mailers are often chosen when a package requirements to travel light, see tidy, and retain the contents concealed from view. The dark outer layer gives a cleaner stop than a plain transparent bag, while still allowing fast packing on a busy dispatch line. For apparel, documents, or small soft products, they reduce empty space and are easier to handle than flimsy outer wraps. The proper value comes from pairing the proper gauge with the proper load, because a bag that is also thin splits in transit and one that is also heavy wastes material and storage space. A well-manufactured mailer retains packing fast and the consignment presentable proper through to delivery.

Buy Online Printed Plastic Courier Bags | Tamper Proof …

Courier bags need to stop interference before a consignment ever reaches the delivery van. A well-manufactured bag uses polythene suppliers film that resists easy tearing, with a closure that shows if someone has tried to open it and seal it again. That matters in returns handling, confidential paperwork, spare parts, and other items where missing contents can cause blame at the dispatch desk. The film has to balance strength with enough give to survive sorting and transit without splitting at the seams. A weak gauge or poor seal quality turns a simple mailing pack into a handling problem, so proper closure design is where the proper value sits.

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.