Sealock manufactures the Thick Thermal Fish Cooler bag that wholesale buyers and fishing brands order to keep a catch fresh from the first cast to the dock. An angler's real problem is not a warm soda — it is a fish that softens in the sun before it ever reaches the cutting board. This cooler answers that by working like a portable refrigerator: a 20mm thick insulated wall sealed with RF-welded construction, sized to ride along on a kayak or a boat and hold the day's fish cold the whole way back.

The 20mm Thermal Wall That Works Like a Refrigerator

Most fishing bags treat insulation as an afterthought. The Thick Thermal Fish Cooler is built around it. A 20mm thick insulation layer wraps the whole compartment, and RF welding bonds the panels into a sealed body rather than a stitched one, so cold stays in and melt-water stays put. That combination is what lets the bag hold a catch at refrigerator-cold through a long day on the water, whether the run home is twenty minutes or the back end of an all-day trip.

• 20mm insulation: a genuinely thick wall, not a thin foil liner, for real cold retention.
• RF-welded body: welded panels and leakproof construction keep melt-water and fish fluids contained.
• Hose-clean inside: a wipe-and-rinse interior clears slime, blood and bait between trips.

Sized and Shaped for the Kayak and the Deck

A fish cooler has to behave on an unstable platform, not just on a kitchen counter. The Thick Thermal Fish Cooler is shaped for it, and the details are aimed squarely at how fishing actually happens:

• Reinforced flat bottom: it sits stable on a rocking kayak or a bouncing deck instead of tipping its load.
• Adjustable strap carry: a single adjustable strap moves it on and off the boat one-handed, hands free for the rod.
• Built-in mesh pocket: an included mesh storage bag keeps pliers, line and small tackle organized on the outside.
• Sturdy zippers, leakproof seams: the closure and welds are made to take repeated, gritty, saltwater use.

The Maker: Sealock

A bag that lets a prize tuna spoil is a bag a serious angler never buys twice, so the build has to be right. Sealock is the cooler brand of YiFuLong Outdoor Gear Co., Ltd., welding insulated fishing and cooler bags since 2003 across three high-frequency welding factories.

The Thick Thermal Fish Cooler: Specifications

Confirmed parameters for the lead model, the Thick Thermal Fish Cooler (SL-C377):

Sizing Up: From Kayak Day-Bag to Offshore Kill Bag

The Thick Thermal Fish Cooler anchors a family that scales with the size of the fish. All are from the same fish-cooler line, with real model numbers and dimensions:

Model	Size	Fits This Fishing	picture	Link
Thick Thermal Fish Cooler (SL-C377)	50 × 30 × 30 cm	Kayak and day boat, panfish to medium catch		View
Large Insulate Fish Cooler Bag (SL-C379)	85 × 35 × 40 cm	Boat fishing, tuna and sea bass		View
Leakproof Insulated Fishing Cooler (SL-C380)	120 × 35 × 40 cm	Offshore, large tuna and big game		View
Waterproof Soft Cooler Tote (RF-welded)	38 × 27 × 31 cm	Drinks and bait, IPX8, 48–72 hr		View

Matching the Cooler to the Catch

The right bag is the one sized to the fish and the platform. Three quick reads point to it.

By Catch Size

Panfish, trout and a medium inshore haul fit the 50cm Thick Thermal Fish Cooler. Tuna and sea bass want the 85cm SL-C379, and offshore big game calls for the 120cm SL-C380 kill bag.

By Platform

On a kayak or small skiff, the compact flat-bottom SL-C377 stows and stays put. On a larger boat with deck room, the long kill bags lie flat along the gunwale and swallow a full day's catch.

For Drinks, Not Fish

When the cold load is cans and bait rather than a catch, the RF-welded Waterproof Soft Cooler Tote with its IPX8 airtight zipper holds 40–44 cans cold for 48–72 hours alongside the kill bag.

Quality Control for Fish-Cooler Bags

A fish cooler is judged on whether it seals, holds cold and survives a salt deck, so the checks target exactly that:

1. IQC (incoming): PVC mesh shell, insulation and hardware are verified before cutting.
2. IPQC (in-process): every RF weld and the leakproof seams are inspected in-line, since one weak seam leaks fish fluid.
3. Full water-immersion test: sealed builds are immersion-tested to confirm the welded body holds, not just sheds splashes.
4. Salt-spray and abrasion: shell and zippers face salt-spray and abrasion rigs for marine and rough-deck durability.
5. Load and zipper tests: a 1,500-plus-cycle load test on the strap and base confirms a bag heavy with iced fish does not give way; a 3,000-cycle zipper test confirms the closure lasts.
6. OQC (outgoing): a pre-shipment final inspection with AQL sampling and a gold-sample comparison clears each order — only passed lots ship from Dongguan or Ho Chi Minh City.

OEM & ODM for Fishing Brands

Tackle brands and marine distributors buy fish coolers to match their own colors, sizing and rigging, so customization starts at the first sample. Sealock runs these as private-label programs and, beyond a logo and color swap, develops a cooler from the ground up — a brand can hand over a sketch, a sample or a target spec, and the China base takes it through sampling to a finished, original bag. Ground-up builds run longer than a stock edit, so a fishing brand should book against its season.

What a fishing brand controls

• Size ladder: set the dimensions across kayak day-bag to offshore kill bag from one supplier.
• Branding: custom shell colors from the white/blue/yellow/black base, plus a printed logo, color-tested for run-to-run consistency.
• Rigging: add rod loops, extra mesh pockets, drain ports or a heavier strap to the brand's design.
• Origin: produce in China or Vietnam on the same spec to manage tariffs and lead times.

Working terms

• MOQ 300 pcs per design, negotiable on custom.
• Sampling 7–15 days; production 30–45 days, FOB Guangdong.
• Trade & payment: FOB, CIF or EXW; T/T, L/C, PayPal and more accepted.

FAQ: Thick Thermal Fish Cooler Bag for Fishing

Q: How well does the Thick Thermal Fish Cooler keep a catch fresh?

A: It works like a portable refrigerator: a 20mm thick insulation layer plus an RF-welded sealed body hold a catch cold through a full day on the water, whether you are running back from a nearby spot or fishing the lake all day. Adding ice extends the hold further.

Q: What sizes does the fish cooler bag come in?

A: The Thick Thermal Fish Cooler (SL-C377) is 50 × 30 × 30 cm for kayak and day-boat use. The line scales up to the 85cm Large Insulate Fish Cooler Bag (SL-C379) for tuna and sea bass, and the 120cm Leakproof Insulated Fishing Cooler (SL-C380) for offshore big game.

Q: Is the fish cooler bag leakproof and easy to clean?

A: Yes. RF welding and leakproof seams contain melt-water and fish fluids rather than letting them seep through stitch holes, and the interior is made to be hosed and wiped clean of slime and bait between trips.

Q: Will it hold up to saltwater boat fishing?

A: The PVC mesh shell and zippers are salt-spray and abrasion tested, and the strap and base pass a 1,500-plus-cycle load test for a bag loaded with iced fish, so it survives a season of boat and kayak use with a freshwater rinse after each trip.

Q: Can Sealock make the fish cooler in our brand's colors and design?

A: Yes. Sealock offers custom colors and logo plus full ground-up development — sizing, rigging and rod loops built from a sketch, sample or spec. MOQ is 300 pcs per design, and ground-up builds take longer, so plan against the season launch.