Leakproof Lunch Box with Thermal Lining
At SEALOCK COOLER, our approach to lunch boxes is simple: to ensure food remains safe, fresh, and easy to carry in any situation.
Leveraging our own factories in China and Vietnam, and over 20 years of experience in waterproofing, insulation, and welding technologies, we've upgraded the lunch box from a "regular food container" to a professional product more suitable for commuting, outdoor activities, camping, and travel. This also gives our brand clients greater control over quality, delivery time, and costs.
What is a Lunch Box?
This product is a portable food storage solution that combines insulation, leak-proofing, lightweight design, and durability. It can:
- Extend food freshness
- Prevent spills and leaks from soiling your bag
- Adapt to various usage scenarios such as commuting, outdoor activities, and travel
- Provide consumers with greater peace of mind and convenience
This is why more and more customers are choosing soft-sided insulated lunch boxes instead of traditional hard containers.
- View as
Picnic Lunch Bag
SEALOCK COOLER has been producing Picnic Lunch Bags for over 20 years, with factories in China and Vietnam covering more than 20,000 square meters and employing thousands of staff. Our products are sold to over 80 countries worldwide, serving more than 3,000 customers, with stable cooperation maintained with our distributors. As a leading domestic manufacturer of picnic refrigerated bags, we enforce strict quality inspections on every batch to ensure excellent performance.
Why choose SEALOCK COOLER instead of a regular supplier?
✔ Dual factories in China and Vietnam to reduce tariffs
✔ 20+ years of experience in waterproof and insulated products
✔ Automated equipment + skilled workers for more stable delivery times
✔ Familiar with European and American brand quality standards
We don't pursue one-time orders, but long-term cooperation.
What are the advantages of our products?
1. Truly effective insulation performance
We are a manufacturer specializing in cooler bags and waterproof bags, so insulation is our core competency.
Multi-layer composite insulation structure
High-density insulation cotton
Seamless high-frequency welded inner liner
Sealed structure design
In daily commuting or outdoor environments, the Lunch Box can stably maintain hot or cold temperatures for 8–24 hours, far exceeding the performance of ordinary fabric lunch bags.
2. Leak-proof and waterproof for true usability
A leaky lunch box renders it useless.
Therefore, we have very strict sealing requirements:
Waterproof TPU/PEVA inner liner
Zipper passes fatigue life testing
Welded parts do not rely on glue
This is also why many customers choose us as their long-term supplier.
3. Lightweight and foldable, more suitable for real life
Compared to traditional hard lunch boxes:
Lighter weight
Foldable for storage
Saves space
Very convenient for putting in backpacks, cars, or office drawers.
Certifications and Quality Assurance
As a manufacturer that has long served the international market, we have passed:
- ISO 9001 Quality Management System
- BSCI / SMETA Social Responsibility Certification
- Higg Index Environmental System
We also hold IPX8 waterproof-related patents and have our own laboratory for testing the Lunch Box:
- Zipper life test
- Peel strength test
- Dry/wet color fastness test
- Salt spray test
All data is traceable, ensuring stable delivery of every batch of products.
FAQ
Q1: Are you a factory or a trading company?
We are a manufacturer with our own factories in China and Vietnam.
Q2: Can the Lunch Box be customized?
Yes, customization of size, color, LOGO, and structure is supported.
Q3: How long is the sample lead time?
Usually 10–12 days.
Q4: What about warranty and after-sales service?
We provide quality assurance under normal use conditions; specific details can be confirmed on a project basis.
As a reliable Lunch Box manufacturer and supplier in China, we have our own factory. If you want to buy high-quality outdoor soft coolers, please contact us.
