Ventra Gear’s Mainframe is a new breathable, removable backpack frame compatible with any backpack on the market. Designed to carry loads of up to 60 pounds, the Mainframe weighs a mere 11 ounces and makes carrying your bag a more breathable and comfortable experience. The device is available in three different sizes, depending on the length of your torso. Learn more at Ventra Gear. – $75
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