100-oz. CamelBak M.U.L.E. Hydration Backpack: $56

Amazon has 100-Oz CamelBak M.U.L.E. 12 Mountain Biking Hydration Backpack (Aluminum/Black) on sale for $56.16 (Reg. $120). Free shipping.

Features:

• Air Support Back Panel: Designed with Body Mapping Technology to allow for maximum ventilation on the hottest areas of your back
• Magnetic Tube Trap: Keeps your tube secure and accessible when you need it
• Removable Waist Strap: Added stability when you need it
• 3D Vent Mesh Harness: Lightweight and breathable with added cargo. Designed for all-day comfort.
• Helmet Carry: Stow and secure helmet