The DeWalt DGC533 33-pocket USB charging tool Backpack is the perfect tool bag or Backpack for every workman. It has a USB charging battery dock that simultaneously charges two devices via USB ports. Maximum 2-amps shared output. There are three internal charging wall pockets that can hold a Tablet, phone, and/or camera and can charge two devices through a USB connection to a 20-Volt max Lithium battery pack. Low battery Cut-Off protection monitors battery voltage to Avoid battery over-depletion. Also equipped with multiple interior panels to hold a multitude of tools and accessories like drills, extension cords, pliers, screwdrivers, wrench sets, drill bits, testers and much more. 31 Multi-use pockets inside and 2 outside help organize a wide variety of hand tools. Padded web carrying handles and adjustable shoulder straps make carrying more comfortable, and convenient. Large pads on back for extra comfort makes carrying heavier loads more comfortable on stress areas of the back. Easy double-pull, heavy-duty zipper for added security. Base Pad feet helps reduce wear and abrasion. *Maximum initial battery voltage (measured without a workload) is 20 volts. Nominal voltage is 18.