I own the camelback Bfm Which i love. its great for my 3+ day Trips. But i also do smaller 1 and 2 day trips, and the bfm is to big and heavy, I dont need alot of storage just a bit. I have narowed it down to thesse 3 the camelback, ambush m.u.l.e., and the viper. I like the storage on the m.u.l.e. I like the desing of the viper even though it dosent look like it can hold much storage. I need a backpack that is tough i hike threw tough moutian terrain where there is not much room to move around. if any one has any information on thesse items and could give any feedback it would be aperciated, thanks.

I have just purchaced a Camelback STOWAWAY for $25.00. It clips to your backpack, day pack etc.

I'd rather go with thier Pakteen or HotShot, which look to be a bit more rugged, and thier mounting to the pack much more so.