Crafted from nylon, this backpack is waterproof and hard-wearing, and it can be carried to anywhere after folded. It has a large compartment that is enough for 2L water bladder and other items. The reflective trim makes the user safer at night, and the survival whistle is useful in unexpected occasion. Its an pack that is suitable for cycling, climbing, camping, hiking, etc. Features: Crafted from nylon, it takes up a mini volume after being folded, portable and convenient. Lots of storage compartment can carry a 2L water bladder (not included), food, folded umbrella, etc. The front fabric is waterproof and hard-wearing, and the back mesh fabric is breathable. Waist pockets carry phones and other items, and zipper mesh pocket is convenient for helmet or raincoat. It is equipped with survival whistle and reflective trim for safer travel. Fits for cycling, climbing, camping, hiking and other sports. Specifications: Color: Blue / Black1 / Dark Blue / Black2 (optional) Gender: Unisex Age Group: Adult Material: Nylon Pattern Type: Patchwork Style: Sporty Size: 46*60cm / 18.1*23.6in Weight: Approx 360g / 12.6oz Notes: 1. Backpack ONLY. Bladder is NOT included. 2. Size information is just for reference only, and allow 1-2cm (0.4-0.8 #34;) differences due to manual measurement, thanks. 3. Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same. Package List: 1 * Backpack