About knapsack capacity and water bag capacity

This product is backpack, water bag is accessories. Backpacks don't contain water bags.

If you only need a backpack, please buy the 'bag only' option. If you need a backpack and water bag, please buy the 'bag + bladder' option.

The capacity of the backpack is 5L (5L is calculated by the length, width and height of the main body of the backpack, which does not represent the carrying capacity of the backpack)

The capacity of the water bag is 2L.