Kayak Bag Manufacturer in China

Sealock is a kayak bag manufacturer in China supplying OEM, ODM, and wholesale buyers worldwide. A kayak is the hardest environment a soft bag routinely faces: the hull sits low in the water, the cockpit and hatches are open to spray, rain and wake, and a capsize turns "water-resistant" into a claim the customer tests personally. A kayak bag has to do three things an ordinary bag cannot — stay dry when fully submerged, float when it comes loose, and compress and lash down so it doesn't move. This overview covers how those requirements translate into construction, the range, and the sourcing terms.

What a Kayak Bag Has to Do

• Survive submersion, not just splash. A correctly rolled dry bag can be dunked, not merely rained on. On moving water capsizing is a matter of when, not if.
• Float. Air trapped inside a sealed bag gives it buoyancy, so gear that comes loose stays at the surface instead of sinking to the bottom of the lake. This is why paddlers are advised not to fill a dry bag with dense metal objects that defeat flotation.
• Compress and lash. A roll-top lets the paddler purge excess air for a smaller, firmer package that bungees to a deck or slides into a hatch. A rigid, air-filled bag simply won't fit where it needs to go.
• Attach securely. D-rings, lash cords and integrated webbing let the bag tie into deck lines. Serious guidance is specific: anything carried on deck should be attached at a minimum of two points, so losing one attachment doesn't lose the bag.
• Not become a hazard. Loose items in a cockpit slide under foot braces and become an entanglement risk during a wet exit. Everything should clip, lanyard or stow.

Each of those is a construction decision rather than a marketing feature, and each one is specifiable on an OEM order.

Sizing to the Boat, Not to the Trip

Kayak bags are unusual in that the hatch opening constrains the size before the trip length does. A bag that holds a weekend's kit is useless if it won't pass through the hatch. The practical guidance paddlers work to:

Capacity	What it carries	Where it goes on the boat
2–10L	Phone, keys, wallet, sunscreen, a snack	Within arm's reach in the cockpit or clipped to deck lines
15–25L	Half a day of gear — change of clothes, rain layer, lunch, first-aid kit	The sweet spot — fits most sea kayak storage hatches
30–40L	Full-day or overnight loads, camping layers, bulkier gear	Tank well or rear hatch, depending on hatch size
45L+	Multi-day expedition and portage loads	Carried on the back between put-ins; stowed or lashed

Two further points that shape a range. First, small bags are their own product, not a lesser version of a big one — experienced paddlers use several small sacks to organise gear inside a larger one or inside a hatch, and assorted colours make identification instant in a dark compartment. Second, whitewater changes the mounting rules: a bag should be lashed to the back deck where it can be reached, never to the bow, where waves can tear it off.

How a Kayak Bag Is Built

• High-frequency welded seams — panels fused at 27.12 MHz with no needle holes. Stitched-and-taped seams rely on adhesive that lifts, sometimes within days of genuine immersion. For a product that will be submerged, welded is not optional.
• A sealing system matched to the use — a roll-top folded three to four times for general paddling, or a compressed rubber sealing strip under a fold-over flap where a higher rating is required.
• Material matched to the hazard — 500D PVC tarpaulin for whitewater, rock contact and abrasion; TPU-laminated nylon where lighter weight, cold flexibility and tear strength matter.
• Reinforced attachment points — D-rings and lash patches stitched to the panels at high tension before the body is welded, so the load path is engineered rather than glued on, then load- and jerk-tested.
• A reinforced base — kayak bags get dragged over rock, gravel and hull edges more than most gear.
• Reflective detail — paddlers are often out at dawn and dusk, and a reflective bag is findable in low light if it goes in the water.

Features That Solve Real Kayaking Problems

Beyond the basics, a few features come up repeatedly in paddling reviews, and several appear across our range:

• Inflation and deflation valves — purge air to compress a bag into a hatch, or inflate it for temporary buoyancy support.
• A front window pocket for a phone — usable and dry without opening the main chamber.
• Transparent windows — identify contents without unrolling, which matters inside a dark hatch.
• A multi-function lock — secures the bag or a paddle board when the paddler leaves the boat.
• Removable straps — a harness is useful on the portage and gets in the way inside a hatch.
• Dry-wet separation — keeps a wet layer away from dry clothing on the way home.

The Factory

• Dongguan: 12,000 m², 400+ staff, nine high-frequency welding lines, around 100,000 units per month; over twenty years in welded waterproof bags.
• Two Ho Chi Minh City, Vietnam plants for diversified origin and US-tariff mitigation.
• Exports to 40-plus countries; 20-plus waterproofing patents; OEM production for brands including OSPREY, West Marine, attwood, SIMMS, PENN and CHUMS.
• Certifications: ISO 9001, BSCI, SMETA P4, HIGG, GRS and SCAN at factory level; Bureau Veritas, SGS, REACH, EN71 and RoHS at product level on relevant models.

Kayak Bag Range

Kayak Dry Backpacks

Welded packs with a carry system, for boats reached on foot and gear moved between put-ins:

Image	Model & specs	Built for	MOQ
	38L Waterproof Dry Backpack for Kayak — 500D PVC, 0.5 mm; semi-circular shell; front window pocket for a phone; multi-function lock for a paddle board; side inflation/deflation valve for temporary flotation support; one-piece EVA back panel to cut weight and heat.	Full-day and overnight paddling	300–500
	SL-E977 Kayak Dry Backpack — 28L; 500D PVC, 0.5 mm; semi-circular shell; phone window; multi-function lock; side inflation/deflation valve; EVA back panel.	A day on the water	300–500
	SL-E978 Waterproof Kayak Backpack — 28L; 500D PVC, 0.5 mm; semi-circular shell; phone window; multi-function lock; inflation/deflation device; EVA back panel.	Paddling with flotation back-up	300–500
	SL-E102 Dry Backpack — 15L (D24.5×H50 cm) / 20L (D24.5×H60 cm) / 30L (D24.5×H75 cm); 500D PVC mesh; custom colours and sizes; sample 7–10 days.	Three sizes on one pattern — a ready-made ladder	300
	SL-J033 Waterproof Expedition Pack — 45L / 55L / 65L (34×23×58 / 68 / 78 cm); 1,916–2,043 g; TPU laminated on 420D nylon; IPX8 via natural rubber sealing strip + fold-over flap + central compression strap; reinforced abrasion base; side lash cords, reflective piping, hook-and-loop patch panel; padded shoulder straps, sternum strap, padded hip belt, haul handle; yellow / black.	Multi-day expedition and portage — carried, not stowed	300–500

Kayak Dry Bags and Hatch Sacks

The bags that go inside the hatch, under the deck bungees, or within reach in the cockpit:

Image	Model & specs	Built for	MOQ
	SL-D135 Kayaking Tube Dry Bag — 500D PVC tarpaulin; roll-top; black, red, blue, yellow, green, grey, orange; fold-seal with back-up Velcro; inner pocket with waterproof zipper; ISO9001, BSCI, Bureau Veritas; supply 20,000 pcs/month.	The core hatch sack — redundant sealing	500
	SL-D045 Airtight Tube Dry Bag with Gas Valve — 20L, sizes 2L to 100L; PVC; gas valve for controlled inflation and deflation; customised colours; sample 5–7 days.	Purge air to fit a hatch, or inflate for buoyancy	500
	SL-D110 Dry Bag with Window — 2/5/10/15/20/30/40/60/80L; 500D PVC tarpaulin; transparent window; red, yellow, blue, green, black, gray, orange, pink; supply 10,000 pcs/month.	Identifying contents inside a dark hatch	500
	SL-D693 Tube Dry Bag with Window & Zip Pocket — 15L (53×36 cm) / 20L (57×38 cm); 500D PVC tarpaulin; IPX7; transparent window; dry-wet separation; floats; detachable reinforced strap, POM buckle; yellow, black.	The 15–20L hatch sweet spot, wet layer kept separate	300
	SL-D025 Kayaking Dry Bag — 5/10/15/20/30/40L with published dimensions per size; 500D PVC mesh; custom colours; sample 7–10 days; supply 50,000 pcs/month.	A full ladder for hatch and deck stowage	300
	SL-D002 15L Wet/Dry Bag — dia. 20×48 cm; 500D PVC tarpaulin; one adjustable shoulder strap; floats; recycled option; silk-screen; sample 3–5 days.	Cockpit-reach essentials; promotional and club orders	300–500

Capacity, material, colourway, closure, valves, windows, lash hardware and branding are all specifiable per order, and a bag can be developed from a sketch. Note the practical planning point: the SL-D025 and SL-D110 each span a full capacity ladder on one pattern, which lets a brand build a complete kayak range without committing to several separate models.

OEM / ODM Terms

Item	Detail
MOQ	300–500 pcs per model
Sampling	3–10 days depending on the build; new tooling quoted separately
Production	20–45 days after sample approval
Materials	500D PVC tarpaulin and mesh, TPU-laminated 420D nylon, recycled (GRS)
Rating options	Verified IPX7 on welded roll-top builds; IPX8 on rubber-seal expedition construction
Branding	Silk-screen, reflective print, welded logo, custom colourway
Origin	Dongguan, China or Ho Chi Minh City, Vietnam

Quality Control and the Customer Inspection Procedure

Quality is gated in three tiers — IQC (incoming tarpaulin, TPU film, valves, buckles and webbing against the signed standard, with colour difference and fastness), IPQC (cutting tolerance, weld integrity, valve and window installation, and lash-point assembly in line, with peel tests on sample welds at the start of each run), and OQC (ISO 2859 AQL sampling, a real water-submersion batch test, and gold-sample comparison, with SGS or QIMA inspection available). Sealock also strictly executes the complete customer inspection procedure on finished goods: unboxing, vacuum extraction, a 24-hour static rest, and air-leak determination — a pinhole that passes a brief dunk still bleeds vacuum over a full day, which matters on a product that will eventually be capsized. The lab additionally runs weld bond and peel strength, a 1,500+ cycle load test with jerk-loading on lash points and strap anchors, buoyancy checks, abrasion, tear, tensile, salt spray, UV, colour fastness and colour difference.

FAQ: Sourcing Kayak Bags

Q: What capacity should a kayak bag range cover?
A: 15–25L is the sweet spot because it fits most sea kayak storage hatches; 5–10L for cockpit-reach essentials; 30–40L for the tank well or rear hatch on overnight trips; 45L+ for expedition and portage. Size to the hatch opening first, then to the trip.

Q: Does a kayak bag need to float?
A: Yes — it's one of the three things a kayak bag must do. A sealed bag traps air and floats, so gear that comes loose stays at the surface. Advise customers not to pack dense metal items that defeat buoyancy.

Q: Why do you build lash points into the panels rather than adding them later?
A: Because all the load passes through them. Lash patches and D-rings are stitched at high tension before the body is welded, so the force spreads across a stitched footprint rather than peeling a welded patch. Paddlers are advised to attach deck gear at two points minimum, which means the anchors have to hold.

Q: PVC or TPU for kayaking?
A: 500D PVC tarpaulin for whitewater, rock contact and abrasion resistance — the safer default. TPU-laminated nylon where lighter weight, tear strength and cold flexibility matter, as on our expedition pack.

Q: What waterproof rating can you build to?
A: A verified IPX7 on welded roll-top dry bags, proven on the finished bag. Our expedition construction, which seals with a compressed natural rubber strip under a fold-over flap, is rated IPX8. We rate to what can be demonstrated on the finished product.

Q: What are the MOQ and lead times?
A: Typically 300–500 pieces per model, samples in 3–10 days, and production 20–45 days after approval.

Talk to the Factory

For quotations, samples, and OEM/ODM proposals on kayak bags, contact Sealock at info@sealock.com.hk or +86-769-82009361. Over twenty years of in-house high-frequency welding, nine welding lines, dual China–Vietnam production, and a full customer inspection procedure on every shipment.