Bag Knowledge
When customizing soft cooler bags, the choice of insulation materials plays a critical role in determining temperature retention, durability, and overall user experience. Let’s explore which inner insulation structures are most effective for soft cooler bag designs.
The most widely used insulation for soft cooler bags is EPE foam combined with an aluminum foil inner lining. EPE foam insulation offers excellent thermal insulation and cushioning while remaining lightweight and flexible. Once laminated with aluminum foil, this composite structure forms a stable inner layer that efficiently reflects heat and cold.
There are two main types of aluminum foil finishes commonly used:
Smooth aluminum foil: This cost-effective option is suitable for short-term use, such as promotional lunch bags, giveaway cooler bags, or lightweight takeaway applications.
Embossed (diamond pattern) aluminum foil: This thicker version provides slightly better insulation and a more premium look, making it ideal for business gifts or reusable insulated lunch bags used repeatedly.
For customers seeking enhanced insulation performance, PE foam (commonly referred to as “white foam”) is often used as a thicker middle insulation layer. This structure allows for additional upgrades by pairing with:
Snowflake aluminum foil
Thicker embossed aluminum film
These combinations create high-end insulation structures that extend cooling performance and improve the soft cooler bag’s structural support—perfect for professional catering bags, bulk delivery cooler bags, or outdoor event bags.
Besides insulation performance, waterproof linings are crucial for soft cooler bag applications involving food delivery, grocery transport, or frozen goods. Two common inner lining options include:
PEVA lining: Food-safe, eco-friendly, and easy to clean.
PVC lining: Stronger waterproof and oil-resistant properties, suitable for more demanding delivery environments.
For premium waterproof performance, ultrasonic sealing is often applied, where PEVA or PVC liners are fully heat-sealed before being sewn into the cooler bag. This technique eliminates needle holes and effectively prevents leakage from the bottom and side seams.
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Order or no-order we are Always here to help you!
We will contact you within 1 working day, please pay attention to the email with the suffix “@yanxinbag.com”.
