The Zoid Hydration Pack by Camelbak is a great pack that holds 72oz (2.1L) of water for any activity you choose to do outdoors. An excellent pack that provides the most minimalist options, making it perfect for entry level riders and day hikes.  Fits over or under an outer layer.

The Rogue Hydration Pack from CamelBak, providing road bikers with 3 bottles worth of hydration, is the best choice for your next century ride. External reservoir access means refill is easy. Plus, a secure pocket holds the contents of your seat bag.

The Blowfish Hydration Pack by Camelbak is an expandable pack that helps you carry extra clothing and gear while supplying you with 3 liters of water.  Designed with an Air Director Back Panel that directs air out the top and sides of the pack keeping you ventilated while you push up that steep hill.  With the expandable part of the pack open you can get 12 liters of space for long days out.

The SnoBlast Hydration Pack by Camelbak is designed to  hold up to 2.1L of water and offers 1190 cu. in. of storage space for extra gear, food and equipment.  Because you are moving and shaking when cruising down the slopes, the SnoBlast has independent suspension harness optimizes fit and stability so you have more freedom to move.  An easy to use retention system holds a snowboard vertically and tucks away when not in use.