Specifications: Material: High Quality Waterproof Nylon Dimensions: 20.9H*11L*5.5W inch Weight: 0.7kg Color: Black/Blue/Yellow/Red Features: Variable Size and Large Capacity: This travel backpack has multiple buckles and a roll-top design that allows you to adjust the size freely. The minimum size is 25L and the maximum size is 33L, enough space for your needs, whether it's a day trip or a weekly trip Multiple Pockets: Built-in main pocket for large items and 1 padded inner sleeve with the safety strap for 15.6 inch laptop. 2 inner pockets provide space for some personal items. 3 front pockets and 2 side pockets Unique and Ergonomic Design: Multiple buckles for a stylish roll-top backpack and a normal daily school backpack, a multifunctional hook belt and a U-buckle for hanging some small items. The travel bag has been designed with a rear trolley sleeve that allows you to slide it firmly onto the handle of a rolling suitcase or luggage Comfortable: Made of high-quality waterproof nylon material and polyester fabric, which is more durable and lighter. Back and straps are made of breathable sponge fabric, which means it is more comfortable to wear, reduces pocket weight and relieves stress. This is the best choice for outdoor and daily use Occasions: Variable size and 4 different colours. Perfect for students, explorers, office, travel, trekking, hiking, camping and more, also a best gift. How do I care for the bag? - Wash it with clean water at normal temperature. - Do not wash with hot water and alkaline detergent. - Hang to dry and store in ventilated place instead of sunlight. - Wash separately to avoid staining. Package includes: 1 x backpack.