1、High-density Oxford fabric, surface water-resistant process, protects your items. 2、The lining is made of insulating aluminum foil material, which keeps warm and cool for a long time, ensuring the freshness of food. 3、Large capacity design, spacious interior, all kinds of fruits and drinks can be easily stored. This insulated lunch backpack for men, with its unique design and comprehensive functions, is the ideal choice for outdoor activities. It not only has a water-resistant function, but also has an insulating aluminum foil lining, which can keep warm and cool for a long time, ensuring the freshness of food. Features: High-density Oxford fabric, surface water-resistant process, protects your items. The lining is made of insulating aluminum foil material, which keeps warm and cool for a long time, ensuring the freshness of food. Large capacity design, spacious interior, all kinds of fruits and drinks can be easily stored. Multi-layered for reasonable storage, external multi-layer storage bag, convenient for item classification and easy to take. Comfortable and pressure-reducing backpack, the shoulder strap is thickened with breathable mesh fabric, easy to carry, and relieves fatigue. Specifications: Material: High-density Oxford cloth + Insulating aluminum foil Color: black, Blue, Dark gray, Light gray (Optional) Size: 32 x 46 x 19cm / 12.6 x 18.1 x 7.5in Weight: 650g / 22.9oz Package list: 1 x  Backpack 1 x  Backpack