We offer both internal and external frame backpacks. Each pack carries the verity of gear that a backpacker will need on their adventure. The frame backpacks are designed to carry heavier loads of 45 pounds and up. The fabrics are attached to a frame either aluminum or composite on the inside or outside. The difference in either the internal versus the external is that on the external frame you can strap sleeping back and other camping stuff allowing you to pack more inside to keep dryer. These frame backpacks are strong and give your back support and help with the distribution of the weight to your shoulders and waist and hips.