Product details: Brand: ROCKBROS Material: Bag body (nylon); shoulder strap (polyester) Capacity: Upper small bag (3.5L); Lower bike bag (14L) Weight: Approx. 888g Size: Upper small bag (24.5 x 19.5 x 11 cm); Lower part (28 x 18 x 34 cm) Color: Black Optimal insulation: Our ROCKRBOS multifunctional bike backpack has a special waterproof inner pocket, perfect for storing ice and keeping food fresh. Enjoy the insulation during outdoor adventures and can also use it to keep warm Large capacity: The total volume of the backpack is 14 liters, providing enough space for your various items. The smaller capacity is 14 liters, perfect for carrying everything you need for your trip Detachable Design: The top of the Rockbros backpack is detachable for flexible use. The upper part has a capacity of about 3.5 liters and can be used individually, perfect for everyday use or as a day bag Safe and Stable: Made of sturdy and thick material, this backpack keeps your items safe and fits snugly against your back with a chest strap, perfect for adventure activities like mountain climbing or cycling, allowing you to move freely Comfortable and Practical: With breathable shoulder straps, easy-to-use zipper openings and side pockets for storing small items, this backpack is not only comfortable but also functional for fishing in the rain, hiking, cycling, camping and more