Proozy offers the High Sierra Classic 2 Series Propel 70 2-Liter Hydration Pack in True Navy or Mercury/Ash/Yellow for $29.99. Coupon code "DN2399" cuts the price to $23.99. With free shipping, that's the lowest price we could find by $6. This BPA-free, antimicrobial pack features a front-load main compartment and a wide opening reservoir.