Skullcandy Hydration Pack
$149.95

Link Hydro Pack 

Slash the silence of the great outdoors with the amp-packed sound of Hydro.
Mountain bikers and hikers get both hydration and audio in this full feature 3-season pack. With its expandable pocket open, you have room for the biggest coats and gear. Zip it down, and it's a super stable, low-profile, breathable summer system.