Michael Josh via Amazon offers the Michael Josh Hydration Pack in Blue for $25.99. Coupon code "J8UEVHG3" cuts it to $15.59. Plus, Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $5.58.) That's $10 off and the lowest total price we could find. It features a 2.5-oz. water capacity, three side pockets, hydration tube, and adjustable straps.