Sundick 15l Waterproof Outdoor Cycling Backpack with Hydration Bladder&Helmet Pocket lightweight funcation outdoor sports rucksack.Includes storage compartments that will fit your clothes, iPad, phones 11" -12" laptops and even a DSL camera. For even more storage, the side pockets allows you to pack even more on your hike. There are also a net pocket for helmet(helmet not include). Adjustable shoulder/chest straps will fit chest sizes from teenagers up to adults (men and women). Reflective patches makes you travel safer at night. DURABLE Nylon material which is water resistant so your belongings stay dry in light/medium rain and also It is durable reduces wear and tear so your pack lasts longer. Eco-friendly Hydration Bladder:Made of food-grade premium quality anti-bacteria EVA materials. Thick EVA bladder material is pressure-tolerant and wear-proof. Manufactured with leak proof sealing technology. Keeps you hydrated. Includes a wide screw cap so you can add ice cubes for an even cooler drink. Package include:1*knapsack,1*1.5L Hydration Bladder,1*Hanger for hydration pack,1*Lucky Gourd card case