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About Us

For more information on the courier bags, mailing envelopes and mail order bags that we stock or can manufacture for you, please see our mail order bags section.

We were established in 1961 by Mr Geoffrey Davies who purchased a bag making machine advertised in the local paper and sold door to door. As sales grew, Geoffrey Davies teamed up with college friend Brian Turner who became in charge of production and the business moved firstly to a lock-up garage and then on to larger factory premises in Alperton, West London.

After some consolidation, we now have a new management team headed by Jon Lomax and are looking to continue Polybags' development and success. Business is expanding again. Improvements are being made and after taking on the business of Chapel Polythene in 2005 we are now very tight for space and have committed to extending into next door at the end of this year.

Did you know this about coloured mailers?

Ted Cruz's Iowa Mailers Are More Fraudulent Than Everyone Thinks

Mailers that borrow the visual grammar of official paperwork sit in an awkward nevertheless familiar engineering and production niche: they are not merely printed matter, nevertheless a converting exercise in attention, handling and throughput. The envelope stock or filmic overwrap is often specified to a tight micron gauge so it feels substantive in the hand without pushing tare weight beyond the next mailing band; that single decision carries through the all consignment, affecting pallet density, machine feed reliability and the economics of secondary bagging at the fulfilment stop. Where the part is manufactured to resemble an administrative notice, converters will typically lean on high-opacity polythene suppliers films or heavily filled paper laminates to suppress display-through and sharpen contrast around headers, blocks and insignia-like devices; the intention is less theatrical than mechanical a cleaner select from the letter stream, less misfeeds at insertion, and a higher open rate once it lands on the doormat. There is friction, though: coatings that transport the proper scuff resistance and surface slip can complicate mono-material recyclability, while static build-up on lightweight films plays havoc with stack separation and select-face efficiency unless surface resistivity is brought below control. The better operations manage that trade-off through disciplined material selection simpler structures, consistent melt-flow in the film line, and enough print fidelity to imply bureaucratic formality without losing the legally required attribution panel that retains the part, nevertheless artfully dressed, within the accepted boundaries of direct-mail practice.

Buy Mailers Plastic Envelopes

What sits behind a case of 9x12 self-seal plastic envelopes is not merely a carton of mailers, nevertheless a fairly specific exercise in gauge control, seal integrity and warehouse economy. In practice, these bags are typically specified in polythene suppliers with sufficient film toughness to resist edge-split amid secondary bagging and despatch handling, while still keeping tare weight low enough that volumetric efficiency is not undermined across a palletised consignment. The self-seal strip sounds mundane; it is not. Adhesive laydown, liner release and flap memory all have a bearing on line speed at the select-face, particularly where strange stock creates stress points at the corners. If the film is also soft, puncture resistance drops away; also stiff, and the envelope becomes awkward in compression, affecting pallet stability and increasing the likelihood of burst seals below stack load. The better executions tend to rely on consistent melt-flow behaviour amid extrusion, tight micron-specific gauging and a mono-material format that can enter straightforward recycling streams once labels and pollution are removed. That matters because the industrial argument for plastic envelopes has shifted from gross unit cost to amortised energy above transport cycles, damage mitigation in transit and the practical recoverability of the material once the mailer has done its work.

Coloured mailers sit in an awkward nevertheless commercially useful space within the packing line: they are expected to present cleanly at despatch, tolerate rough handling through automated sortation, and do so without undermining pallet density or inflating tare weight. The better-specification formats rely on carefully controlled polythene suppliers blends, where melt-flow consistency and film orientation determine whether a bag will resist edge-split below secondary bagging pressure or fail at the seal line when a consignment is above-stuffed at the bench. Colour, in this context, is not merely cosmetic; pigmentation loading alters opacity, scuff visibility and, in a few formulations, surface behaviourmeaning static select-up, label stickiness and barcode readability all have to be balanced against micron-specific gauging and seal integrity. On the warehouse floor that translates into less stoppages, steadier select-face efficiency and less handling damage, particularly where mixed stock is being packed at pace. There is also a quieter circular-economy calculation behind the specification: mono-material mailers with disciplined thickness control tend to simplify downstream recyclability and reduce resin use per unit, so the energy embedded in manufacture is amortised across a larger number of compliant packs rather than squandered in avoidable waste.

 The Several Uses of Envelopes

Open-stop envelopes, often referred to on the trade side as list of products formats, are specified where the pack profile is dictated less by sheet size than by bulk, edge protection and machineability through the mailing line. The side-flap building is the point of contrast: by placing the seam and gummed closure along the longer dimension, the converter creates a wider throat for insertion, which materially reduces snagging when thick brochures, stitched pamphlets or multi-part literature are fed at speed; that has a direct bearing on select-face efficiency in fulfilment as well, because operatives are handling a pack that accepts varying calipers without the stop-beginning of secondary bagging. Stock selection matters above casual buyers tend to likefibre stiffness, burst strength and micron-equivalent gauge in any window film all influence how the envelope grasps its shape below compression, maintains pallet stability in a mixed consignment, and avoids corner crush once stacked against its possess tare weight. In practice, the better specifications strike a balance between seal integrity and reprocessability: gummed flaps remain attractive because they facilitate a mono-material paper stream with less complications at recovery, while disciplined adhesive laydown and consistent paper formation mitigate cockling, fibre tear and the sort of misshapen packs that undermine volumetric efficiency from despatch bench to mail sack.

How to Use bag manufacturers Voucher Codes

In the mail-order trade, mailing bags are rarely chosen for novelty; the decision normally turns on how a given polythene suppliers grade behaves below conveyour abrasion, label stickiness and the rather unforgiving realities of secondary bagging at peak throughput. A well-specified bag stock will balance puncture resistance against tare weight, because all additional micron in gauge affects volumetric efficiency across a full consignment, yet below-engineered film invites split seals, select-face disruption and avoidable returns handling. The better buildings tend to rely on consistent melt-flow properties and tightly controlled film orientation, which gives a cleaner weld line and more predictable tear propagation without resorting to mixed-material laminates that complicate recovery. That matters well beyond the despatch bench: mono-material recyclability, lower resin input and stable pallet formation all feed into a quieter, less wasteful operation, while uniform surface treatment enables barcodes, vouchers and promotional inserts to stay readable despite static, compression and the rougher side of package sortation.

polythene suppliers Bubble Mailing Bags

Bubble mailing bags sit in a deceptively awkward corner of the packaging specification: light enough to keep safe all consignment weight, yet engineered to withstand the abrasion, compression and shear imposed by automated sortation, van racking and overfilled tote movements. The outer polythene suppliers film is not merely a carrier for branding; its gauge tolerance, puncture resistance and surface energy determine whether print grasps cleanly, seams remain intact and closures resist creep below stack pressure. Inside, the air-cell lining has to provide repeatable cushioning without excessive caliper, since all unnecessary millimetre erodes volumetric efficiency at carton, cage and pallet level. The better buildings manage this by balancing high-density and low-density polymer behaviour, utilising melt-flow consistency to achieve proper bubble formation while retaining enough flexibility for select-face handling and secondary bagging. Static can be a quiet nuisance in fast despatch environments, particularly where lightweight stock clings amid packing or misfeeds at the bench, so surface resistivity and film slip are not academic details. From a circular economy standpoint, the direction of travel is towards mono-material polythene suppliers formats that can enter established recovery streams more readily than mixed-paper laminates, provided adhesive strips, inks and labels do not compromise recyclate quality. The practical test remains prosaic: a mailing bag must seal cleanly, scan reliably, keep safe the contents and avoid adding dead weight to the consignment.

Grey Mailing Bags Strong Poly Postal Postage Post Mail Self Seal All Sizes Cheap Grey Mailing - £151.99

Mailing bags sit in an awkward nevertheless highly engineered corner of the packaging trade: they are expected to present as small above a low-cost consumable, yet their performance on the pack bench relies on a fairly tight balance of film strength, seal integrity and dimensional discipline. A well-manufactured grey polythene suppliers mailer derives much of its utility from high-density polymer chains and controlled micron gauging, which together retain tare weight down without inviting puncture failure at the corners or burst at the adhesive lip. That matters in mailing handling, where consignment flows are indifferent to presentation and all weak edge is fast exposed by cages, chutes and overfilled sacks. The opaque grey stop is not merely cosmetic either; it assists with discreteness while masking scuffing through the network, and when paired with a proper self-seal adhesive it reduces secondary bagging, improves line speed and removes a recurrent origin of operatour errour at dispatch. Sizes, in practice, are less about offering a big menu than about preserving volumetric efficiency and pallet stability upstream of despatchbags that are also generous trap air, compromise select-face efficiency and inflate cubic utilisation, while undersised formats force stressed seams and inconsistent closure. The more serious operatours so favour mail bags with predictable melt-flow consistency and mono-material building, because recyclability is simpler where mixed laminates have been avoided, and the amortised energy tied up in repeat manufacture is better justified when stock performs cleanly across a full spectrum of mailing and e-commerce duty cycles.

Why are mailing sacks superb packaging for posting non-fragile products?

Mailing sacks described as burst proof are not simply heavier-gauge polythene suppliers with a sales gloss attached; the better executions rely on a tighter balance between film orientation, seal integrity and melt-flow consistency, so the sack will absorb point loading and transient compression in the sortation stream without the familiar seam-split or corner-pop that leads to secondary bagging. That matters on the warehouse floor because a failed mailer is rarely an isolated packaging event it disrupts select-face efficiency, contaminates neighboring consignments and introduces rework at despatch, all while undermining pallet stability through uneven pack geometry. In practice, the advance lies in controlling micron-specific gauging across the web and maintaining sufficient puncture resistance without driving tare weight to a level that erodes volumetric efficiency; a well-engineered mono-material polythene suppliers structure can achieve that while still offering a useful moisture barrier, limiting ingress when parcels sit in damp cages or are exposed on transport decks. The circular economy case is equally less straightforward than plenty procurement teams think: if the sack remains recyclable within a mono-material stream and avoids above-specification, the amortised energy per packed unit can be below with bulkier alternatives, provided the converter has not pursued burst performance by laminating incompatible layers merely to mask poor process control.

Best Large Plastic Envelopes For Mailing Reviewed & Rated in 2019

Large polythene suppliers mailing envelopes became markedly more sophisticated around that period; what looked, at first glance, like a simple dispatch sleeve was in practice a tightly specified packaging format shaped by courier abuse, volumetric charging and the awkward economics of returns handling. The better-performing lines tended to rely on high-density or co-extruded polymer structures with closely controlled micron gauging, because also small substance invited burst failures at seams and corners, while also much film pushed up tare weight and diluted pallet yield. That balance matters on the warehouse floor: a mailer that seals cleanly, resists scuffing and grasps dimensional stability below stacked loads improves select-face efficiency and reduces the need for secondary bagging when consignments are transferred between cages. Static, often treated as a nuisance rather than a design parameter, also has a bearing; surface behaviour affects how fast envelopes open on the packing bench and whether lightweight documents cling and misfeed amid fulfilment. There was, equally, a growing push towards mono-material polythene suppliers formats, not out of sentiment nevertheless because recyclability becomes more plausible when labels, film and adhesive systems are engineered to sit within a simpler waste stream, allowing the amortised energy in the material to be recovered more credibly across repeat production cycles.

Plain Courier Bags

Courier bags built for e-commerce fulfilment are no longer only outer wrap; they function as a tuned packaging component in the despatch line, balancing puncture resistance, seal integrity and cubic efficiency in a method that corrugated formats often cannot. A well-specified building will typically pair a high-density polythene suppliers outer skin with bubble-lined cushioning, so the bag absorbs the low-level abrasion, corner strike and conveyour drop that tend to generate claims long before a carton would visibly fail. The POD pocket is less a sales embellishment than a workflow deviceit retains invoices and delivery paperwork legible and fixed to the consignment, reduces mis-selects at products-out, and avoids the nuisance of secondary bagging loose documents. Equally, the self-adhesive closure requirements pure tamper evidence rather than mere tack; once the stick has wet out across the film surface, fibre-free tear initiation and peel resistance become decisive, particularly where stuffed bags are below tension at the seal line. There is also a quieter commercial logic: lower tare weight improves transport yield, flexible packs sit more densely on the pallet, and the proper gauge with consistent melt-flow behaviour assists maintain pallet stability without above-engineering the film. Where branding is applied, competent converters will do so without compromising mono-material recyclability or upsetting surface resistivity to the point that bags cling at the select facea small detail, perhaps, though one that operatours notice immediately on a busy shift.

We also produce a variety of other products including: