SL-P1133 Waterproof Vacuum Compression Bag with Clear Window and One-Way Air Valve

Sealock manufactures and supplies the SL-P1133 Waterproof Vacuum Compression Bag with Clear Window and One-Way Air Valve as a packing-system component for luggage brands, outdoor retailers, travel-goods programs and corporate gift buyers. The design answers a specific complaint about the compression bags already on the market: most of them are thin polyethylene sleeves with a zip-lock rail and a rubber flap valve, which compress well on the first use and then fail at the rail after a dozen cycles, offer no protection against a burst water bottle in the same case, and give the user no way to tell one anonymous white brick from another.

SL-P1133 is built from the same 0.30 mm TPU-coated fabric Sealock uses for its dry bag line rather than from packaging film. The shell is closed with heat-sealed seams that leave a continuous fused edge instead of a needle line, and the closure is a genuine PU-laminated waterproof zipper with a moulded T-pull, the same class of component that goes into a rolltop-alternative dry duffel. The result is a compression bag that survives repeated loading cycles, resists rain, splashing, dust and damp, and holds its compression through a long transit leg instead of slowly re-inflating overnight.

Compression itself is handled by a one-way exhaust valve set into the side panel. After the zipper is closed, the supplied hand pump threads onto the valve and pulls air out; the valve's internal diaphragm then holds the vacuum without any need to kneel on the bag or roll it against a wall. Removing the pump and unscrewing the cap vents the bag instantly when the user wants their clothes back at full loft. Because the valve is a mechanical component seated in a punched panel opening, SL-P1133 is engineered as a rain-, splash-, dust- and damp-resistant pack and is not rated or intended for submersion.

At a Glance

• True vacuum compression — a one-way exhaust valve with detachable hand pump pulls trapped air out of the pack, collapsing a loose armful of clothing into a flat 48 × 29 × 10 cm slab that stacks cleanly in a duffel or hard case.
• Waterproof zipper, not a roll-top — a PU-laminated waterproof zipper runs the full length of one side with a T-shaped pull, so the bag opens flat for loading and closes without the bulk penalty of a roll-and-buckle closure.
• Oval clear inspection window — a 0.40 mm optical-grade TPU window welded into the top panel identifies contents at a glance, which matters when four identical bags are stacked in the same case.
• Heat-sealed shell, no stitch holes — the body is closed with heat-sealed seams rather than sewn seams, so there is no needle perforation for water, dust or fine sand to migrate through.
• Two orange pull loops — reinforced webbing loops welded into opposite ends give a grip point for pulling a compressed bag out of a tightly packed case and a hang point for drying the bag after use.

One-Way Exhaust Valve and Detachable Hand Pump

The valve is a two-part PP assembly: a flanged base heat-welded into the side panel, a spring-free silicone diaphragm that seats under differential pressure, and a threaded cap with an integrated gasket that seals the port when the pump is not attached. The supplied hand pump threads directly onto the base — no adapter collar, no separate hose — and roughly fifteen to twenty strokes are enough to draw a full 14 L load down to its compressed profile.

The diaphragm design matters more than the pump. Cheap compression bags use a passive rubber flap that leaks slowly under the residual spring-back pressure of compressed textiles, which is why so many of them are visibly re-inflated by the next morning. The SL-P1133 diaphragm seats against a machined shoulder and is backed by the threaded cap, so the bag is holding vacuum against two independent seals rather than one. In Sealock's own retention check, a fully evacuated bag is left to stand for 24 hours and then measured; any bag that recovers measurable thickness is rejected at OQC.

Waterproof Zipper Closure with T-Pull

The loading closure is a PU-laminated waterproof zipper running the full 48 cm side of the bag, terminating in welded end caps that carry tension away from the last teeth — the point where most zipper-closed bags eventually split. The slider carries a moulded T-shaped pull rather than a cord loop, which gives enough purchase to open the zipper with cold or gloved hands and does not tangle with the pull loops when several bags are stacked.

A full-length side zipper changes how the bag is used compared with a zip-lock rail. The bag opens flat, so a folded stack of shirts goes in as a stack rather than being fed in one piece at a time, and repacking at the far end of a trip takes seconds. Because the zipper is laminated rather than coated, it stays supple in cold conditions and does not develop the chalky stiffness that PU-coated zippers show after a season.

Clear TPU Inspection Window

A 0.40 mm optical-grade clear TPU panel is welded into the top face inside a raised frame. The frame is not decorative: it holds the window flat under compression so that the clear panel does not distort into a lens when the bag is evacuated, and it moves the weld line away from the flex zone at the window edge, which is where clear panels normally crack first.

For a packing system this is the difference between a labelled bag and an anonymous one. A traveller with four compressed bags in a case can identify base layers, insulation, dirty laundry and spares without unsealing anything, and a rental, expedition-outfitting or crew-kitting operation can audit a locker visually. The window is also available deleted or replaced with a printed label patch as a running change for OEM programs.

Heat-Sealed Shell and Reinforced Pull Loops

Every structural seam on SL-P1133 is heat-sealed. The two shell panels are fused along a continuous bead, the valve flange is fused into the side panel, the window frame is fused into the top panel, and the zipper tape is fused rather than stitched to the shell. Nowhere on the bag is there a stitch line, which removes the standard leak path and also removes the standard abrasion failure — a sewn thread standing proud of the surface is the first thing to wear through inside a case.

Two orange webbing loops are welded into opposite ends under a reinforcement patch. Under vacuum a compressed bag becomes rigid and slick, and pulling one out from the bottom of a packed case by pinching the fabric is genuinely awkward; the loops solve that. They also serve as hang points for air-drying the bag inside-out after it has carried wet or soiled kit.

Engineering Specifications

Material Specifications

Functional Specifications

Customization / OEM Specifications

Sealock has run OEM and ODM programs for outdoor and travel-goods brands for over 20 years, and the most demanding requirements on this platform can be met. Development does not have to begin from an existing model: our engineering team regularly builds products from scratch off a customer's sketch, a physical sample, or nothing more than a target specification sheet, taking the project through structural design, tooling for valve and window components, pattern development, sealing-parameter validation and pilot production. Alongside high-frequency and heat-sealing capability, our in-house sewn production line is an equally professional capability, so hybrid welded-and-sewn constructions are fully supported. Ground-up custom development carries a longer lead time than a modification of an existing platform, and we will state that timeline honestly at the quotation stage rather than after tooling has started.

Packaging Specifications

Recommended Use

Two of the exclusions deserve a word of explanation rather than a bare mark. Submersion is excluded because the exhaust valve is a mechanical component seated in a punched panel opening; the bag will shrug off rain, spray and a soaked case floor, but it is not an immersion-rated dry bag and should not be sold as one. Down insulation is excluded on garment-care grounds rather than product grounds — compressing down for weeks at a time damages loft permanently, which is a property of the fill, not of the bag.

Quality Inspection Standards

Quality control runs across three gates. IQC screens incoming TPU-coated fabric, clear window film, zipper tape, valve assemblies and webbing against approved samples, with lot-level checks on coating thickness and diaphragm seating. IPQC monitors sealing temperature, pressure and dwell time at the welding stations in real time and pulls destructive seam samples at set intervals, since a drifting weld parameter is the single most common cause of a compression bag that passes visual inspection and then fails in the field. OQC performs the full functional check on every carton lot.

Customers are welcome to run our own incoming-inspection procedure on receipt, and we will document it on request: unbox the bag, evacuate it fully with the supplied pump, leave it standing undisturbed for 24 hours, then assess for air leakage by measuring recovered thickness and listening at the valve and seam lines. This is the same sequence our OQC team executes and it will reproduce our results. Third-party inspection by SGS, QIMA or a buyer-nominated agency can be arranged at any stage of production.

Product Highlights

Printing & Logo Options

The flat top and bottom panels give a large uninterrupted print area on either side of the window, and the side panels carry a secondary band. Screen printing suits solid one- to three-color marks and is the most economical route at volume. Heat transfer handles photographic gradients and fine detail. A welded TPU logo patch produces a tonal, dimensional mark that survives abrasion better than any surface print and is a common choice on the matte black shell. Embossing the shell during the sealing cycle gives a subtle debossed logo with no added material. Zipper pulls, webbing loops and the valve cap can all be color-matched, and woven-label loops are available where a brand wants its mark on the handling point itself.

OEM / ODM and Wholesale

SL-P1133 is available as a stock platform for wholesale and as a development base for OEM and ODM programs. Minimum order quantity is 300 pieces per color for the standard configuration, with FOB terms from Guangdong. Sample lead time is 7–10 days for a stock unit with applied branding, and longer where new tooling for a valve, window shape or custom size is required. Sealock has built waterproof and welded gear for over 20 years, operates facilities in Dongguan, China and Ho Chi Minh City, Vietnam, and produces for outdoor and travel brands including OSPREY, STANLEY, snow peak, MUJI and DESCENTE. Buyers running programs across multiple SKUs can consolidate compression bags with dry duffels and packing accessories in a single production and shipping schedule.

Related Products

Buyers specifying a full packing system usually pair this bag with the SL-P1082 three-size vacuum compression packing bag for a graduated set, and with a weatherproof outer carrier such as the 55 L airtight-zipper waterproof duffel, the 20 L waterproof travel and gym duffel or the 70 L concealment-camo waterproof duffel. For small items that need genuine immersion protection rather than weather resistance, see the multi-purpose waterproof pouch.

FAQ

Is this bag waterproof enough to be submerged?

No. SL-P1133 is engineered as a rain-, splash-, dust- and damp-resistant pack. The shell and seams are sealed, but the exhaust valve is a mechanical component seated in a punched panel opening, and the closure is a waterproof zipper rather than an airtight zipper. It will protect contents from rain, spray, condensation and a wet case floor; it is not an immersion-rated dry bag and should not be specified as one. For submersible protection, our airtight-zipper dry bag range is the correct product family.

Does it lose vacuum overnight the way cheap compression bags do?

That failure is the most common complaint on marketplace listings for compression bags, and it comes from a single passive rubber flap leaking against the spring-back pressure of compressed textiles. SL-P1133 uses a seated silicone diaphragm backed by a gasketed threaded cap, so the vacuum is held by two independent seals. Every lot is checked with a full evacuation followed by a 24-hour static hold, and any bag that recovers measurable thickness is rejected.

Do I need the pump, or can I roll the air out by hand?

The pump is the intended method and it is included. Rolling works on a soft load if you are patient, but it will not reach the same compression ratio and it stresses the valve flange in a way the pump does not. Where a customer's program needs a faster or hands-free option, a USB-C rechargeable electric pump variant is available as a running change.

Will the zipper split under compression?

The zipper is not carrying the compression load. The vacuum pulls the two shell panels together, which loads the welded seams, not the closure. The zipper ends are protected by welded end caps, which is the specific point where cheaper zipper-closed bags fail, and the tape is fused to the shell rather than stitched. Zipper fatigue is verified to 3,000 cycles.

Can I compress a down jacket or down sleeping bag in it?

For a travel leg, yes. For weeks or months of storage, no — and this is a property of down rather than of the bag. Sustained compression permanently damages down loft. Store down uncompressed and use SL-P1133 for the trip itself.

Will the clear window crack or go cloudy?

The window is 0.40 mm optical-grade TPU welded inside a reinforcement frame. The frame keeps the panel flat under vacuum so it does not distort into a lens, and it shifts the weld line away from the flexing edge, which is where unframed clear panels typically craze first. Window clarity retention is verified by flex cycling during production validation.

How much clothing does one bag actually hold?

Roughly 25–30 L of loose apparel — in practice around six to eight T-shirts plus two mid-layers, or a week of base layers for one person — compressed down to a 48 × 29 × 10 cm slab. Final compressed thickness depends on what is inside; knitwear and fleece compress far more than woven shells.

Can I use it for wet or dirty laundry on the way home?

Yes, and it is one of the main reasons buyers specify a sealed shell rather than a film sleeve. The interior wipes clean and the welded seams have no thread to hold odour. Hang the bag inside-out by the pull loops to dry afterwards. Do not leave damp textiles sealed under vacuum for several days.

Can we get it in our own colors, sizes and branding?

Yes. Custom Pantone-matched shell colors, custom dimensions to fit a specific case footprint, multi-size sets, alternative window shapes or a deleted window, color-matched zippers and webbing, and screen printing, heat transfer, welded patches or shell embossing are all supported. Ground-up development from a sketch or a target specification is also available, with a longer lead time we will state at quotation.

What is the minimum order quantity and lead time?

MOQ is 300 pieces per color for the standard configuration, FOB Guangdong. Samples ship in 7–10 days for stock units with applied branding; new tooling for a custom valve, window or size extends that. Bulk production lead time depends on order size and season and is confirmed at order placement. Third-party inspection by SGS, QIMA or a buyer-nominated agency can be scheduled at any production stage.

Request a Quote

YiFuLong Outdoor Gear Co., Ltd. (Sealock)
Email: info@sealock.com.hk
Tel / WhatsApp / WeChat: +86-13632981825

Send us your target size, color, branding method and annual volume, and we will come back with a quotation, a lead time and a sample plan for the SL-P1133 waterproof vacuum compression bag.