1. Large capacity: The capacity is up to 30L, which can hold a box of 600ml beer (12 packs) and a box of 255ml beer (36 cans) to meet your needs for open meals.2. Internal waterproof: Internal EVA material, high temperature laminated film, good waterproof effect, no need to worry about melting ice.3. Three-layer constant temperature: The three-layer material keeps warm and locks the temperature, and the internal circulation system keeps warm and fresh.4. Wear-resistant material: The exterior is made of polyester material, which is wear-resistant and durable.5. Nylon mesh bag: Both sides are equipped with nylon mesh bag, the size of the bag mouth can be adjusted, and small items can be placed.6. Breathable design: Breathable thickened foam pads are used on the back and shoulder straps, which have good resilience, fast heat dissipation, and comfortable ventilation.7. Applicability: Suitable for self-driving tours, outdoor gatherings, picnics, etc., to enjoy a good spare time.8. Good airtightness: Waterproof material, waterproof zipper, top opening design, better airtightness.Specifications:Product name: Cooler backpackColor: Black, green, yellow, dark blueMaterial: Polyester (outer), EVA (inner)Capacity: 30LSize: About 31*25.5*42cm/12.20*10.04*16.54inch(L*W*H)Package Includes:1Pc * Cooler backpackNote:Insulation and refrigeration of items will affect the environment to a certain extent, and the constant temperature time with ice packs is longer.