The hydration backpack has multiple pockets to enable all the space you require to store your various necessities. It can store mobile phones, keys, thin raincoats, food, water pack and other outdoor products. Where water free flows fast and does not drip when locked, making it an ideal cycling backpack, hiking backpack, running backpack, also suitable for other outdoor sports - walking, skiing, snowboarding, mountaineering and trail running. It can work well with 2L water bottle (not included)