B&H Photo Video offers the Teton Sports Oasis 1100 Hydration Backpack
in Black, model no. 1001-B, for $23.50
with free shipping
offers it for the same with free shipping for Prime members.) That's the lowest total price we could find by $16. It features a 2-liter hydration bladder with 2" opening, kink-free sip tube, cushioned bite valve, 18-liter pack capacity, three zip pockets, stash space, two mesh pouches, ventilated foam shoulder straps, waist belt expandable up to 60", and chest shock absorber.