CTD also has a knock off of the Maxpedition Prodeus. Same size, but about a third the cost. I might say give that a try, with one of the tiny Camelbacks, and if it works, upgrade to the Proteus for durability.
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-IronRaven

When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.