I found this cool water bladder back pack to take out with me when I go fishing. The thing I like about this is that when I fish the Muammee River, I usually wade and fish out in the middle of the river for long periods of time. With this backpack I can keep hydrated and it conveniently straps to my back  so I dont have to head to the shore to get something to drink.

Features:
Made of high density nylon material, durable and water resistant
3L capacity for you to store enough water while going out
45cm – 86cm adjustable shoulder strap and 17cm – 33cm adjustable chest belt
Plug in buckle, convenient to use
Equipped with a 105cm tube to drink water ( pull the nozzle out then you can get the water inside your bag )
A switch on / off bite valve, convenient for controling the flow of water
With soft pad on the back, shock resistant and comfortable to wear
Perfect to use them when fishing, hiking, climbing, riding and other outdoor activities