Backpack Features: - 8L running backpack, made of ultralight water-resistant and tear-resistant 60D nylon- Adjustable shoulder strap to fit your body size, effectively avoid the backpack shaking while running- Reflective strips for safe riding at night- Small pouches at shoulder strap design for storing your cell phone and other small things- Mesh and poriferous EVA design at the back for maximum breathability and comfort- Bag size: 31 x 8 x 42cm / 12.2 x 3.15 x 16.54 inches- Shoulder straps length: 48 - 66cm / 18.9 - 25.98 inches- The maximum loading weight: less than 30kg- Lining material: polyester1.5L Water Bag Features: - Capacity: 1.5L- Bite type yielding water design with a mouth cover, safer and tidier to drink the water- Automatic sealing valve design, effectively leak-proof- Handle design bring you portable and easy experience- Super leak-proof big mouth design with a detachable seal, easy to clean inside- Foldable design, easy to carry- Affordable water temperature: -20 to 50 Deg.C- Length of tube: 100cm / 39.37 inches- Material: high-quality PEVA and ABS, environmental friendly and non-poisonous, safe to use Application Position: Back Gender: Boys,Girls,Men,Women 0.435 Package weight: 0.489 kg Package Size(L x W x H): 44.00 x 28.00 x 7.00 cm / 17.32 x 11.02 x 2.76 inches Package Contents: 1 x 8L Running Backpack, 1 x 1.5L Water Bag