The new Think Tank Photo Backpack Connection Kit mounts any size Digital Holster V2.0 to any Think Tank backpack. This is an essential accessory for photographers who need to keep a camera and their main lens close at hand with additional required photo gear in a backpack. The Backpack Connection Kit was specially designed to prevent the Digital Holster from excessive movement while being worn in front of the torso. The Backpack Connection Kit works exclusively with Think Tank Photo backpacks.