i have a north face backpack, but it didnt come with a water reservoir but i would like to purchase one, where can i do that
Most any of the bladders will slide into the pocket of your pack that has been designed to hold it. There are a couple of manufacturers! Camel Back being the best. There is one other that looks good, but I've had numerous problems with the snap together hoses leaking.
Often there are different fastener ways. Camel backs have a hook in the middle which hooks into a loop sewn into the pack. Others have toggle holes which are designed for specific packs. These are usually just for convenience of packing anyway and with a full pack the bladders never really need to be held in place other then with the pocket that they go into.
You can purchase these Bladders and the accessories for them (get the dryer) at most outdoor stores. I've even seen some knockoffs at wall mart, but I wouldn't trust their durability.
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