Large capacity & adjustable: maximum capacity 15L, 24 cans of Coke 330ml. Normal capacity is 11L, 20 cans of Coke. The upper and lower layers are separated from wet and dry, suitable for most lunch box sizes. It can meet individual, family camping, beach, hiking and other needs as needed. Premium Material: The outside of the cooler bag is made of 900D high density water and stain resistant Oxford cloth for durability. The inner lining adopts high-quality sewing technology, and PU, 6mm thick EPE foam and high-strength aluminum foil are tightly sewn together, which is waterproof and easy to clean, and has excellent heat resistance. Convenient and practical design: The zippered front pocket can be used to store small items such as keys, mobile phones, napkins, wallets and snacks. Two stretchy side pockets hold water glasses and a folding umbrella for easy access. Velcro on the front pocket, you can stick your favorite Velcro with unique personality. Portability: The generous handle and detachable and adjustable padded shoulder strap make it stress-free and unclunky in both hand and single-shoulder carry. How to free up expandable space? Facing the back of the insulated lunch bag, there is a separate zipper on the upper left corner. You can pull this zipper and move it to the right to end. On the contrary, you can shrink the space, which is very convenient to use. This product comes with a detachable shoulder strap, if you find no shoulder strap after receiving the goods, you can contact us through the buyer's message, we will reply in time to fill the missing shoulder strap If you are unsure about the mens lunch bag size description, please use Amazon's Size Guide tool, which provides size recommendations based on your specific needs (e.g., work, hiking, travel, etc.).