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
Portable Lunch Cooler
SEALOCK COOLER focuses on the research and manufacturing of Portable Lunch Coolers. Our factories in China and Vietnam have established comprehensive quality control systems and hold six international certifications, including SMETA, HIGG, and SCAN. We firmly believe that high-quality products are the foundation of cooperation, and honest management is the cornerstone of long-term development. We look forward to working with you and becoming your most reliable supply chain partner in the Chinese market.
Leakproof Lunch Box Cooler
We have been focusing on the research and production of Leakproof Lunch Box Cooler for many years, with factories in China and Vietnam, and have established a complete quality control system. We have passed international certifications such as SMETA, HIGG, SCAN, etc. We have always believed that good products are the beginning of cooperation, and honest management can go further. I hope to cooperate with you and become your most reliable supplier in the Chinese market.
Insulated Soft Travel Lunch Bag
For over 20 years, Sealock Outdoor Group has been dedicated to the research and production of high-performance Insulated Soft Travel Lunch Bag products. We have maintained long-term cooperation with international brands such as Stanley, Osprey, Musto, Simms, Hydro Flask, etc., and have won the trust of our customers with solid craftsmanship.
We have three fully equipped high-frequency welding factories. The sample development and main fabric procurement are completed domestically, and customers can freely choose factories in China or Vietnam for mass production. Both factories in these places are proficient in producing fully welded bags and sewn bags. It is worth mentioning that choosing a Vietnamese factory can also help European and American customers save a lot of tariffs.
We have three fully equipped high-frequency welding factories. The sample development and main fabric procurement are completed domestically, and customers can freely choose factories in China or Vietnam for mass production. Both factories in these places are proficient in producing fully welded bags and sewn bags. It is worth mentioning that choosing a Vietnamese factory can also help European and American customers save a lot of tariffs.
Insulated Large Lunch Bag
For over 20 years, SEALOCK COOLER has been dedicated to developing and producing high-quality Insulated Large Lunch Bags. We maintain long-term partnerships with international brands such as Stanley, Osprey, Musto, Simms, and Hydro Flask, earning a strong reputation through solid craftsmanship and reliable quality.
We have built three factories equipped with advanced high-frequency welding equipment. The sample development and main fabrics are completed domestically, and customers can freely choose factories in China or Vietnam for mass production. The factories in these two places are proficient in both full welding and sewing processes, and the quality is equally excellent. It is worth mentioning that choosing a Vietnamese factory can also help European and American customers save a lot of tariffs, making it more cost-effective.
We have built three factories equipped with advanced high-frequency welding equipment. The sample development and main fabrics are completed domestically, and customers can freely choose factories in China or Vietnam for mass production. The factories in these two places are proficient in both full welding and sewing processes, and the quality is equally excellent. It is worth mentioning that choosing a Vietnamese factory can also help European and American customers save a lot of tariffs, making it more cost-effective.
Insulated Lunch Bag
SEALOCK COOLER focuses on creating Insulated lunch Bag. Our durable products have earned the trust of international brands like Stanley, Osprey, and Hydro Flask, with whom we maintain long-term partnerships.We run three specialized welding factories. While we develop samples and source fabrics in China, we offer flexible production options at our Chinese or Vietnamese facilities. Both locations expertly craft fully welded and sewn bags, with our Vietnam plant providing added tariff advantages for customers in Europe and America.
Lunch Cooler Bag
SEALOCK COOLER has been making lunch cooler bags for over 20 years, with comprehensive factories and production systems in China and Vietnam. Our products are exported to over 80 countries, serving more than 3,000 customers and maintaining long-term partnerships with numerous distributors. Every batch undergoes strict quality inspection before leaving the factory, ensuring that every customer can choose our products with confidence.
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.
