Whoops. First time ever posting a photo! I built 2 trip boxes and a kitchen box from plans in Gilpatrick's book "Building Outdoor Gear". I've added 2 cinch straps to the kitchen box {center} since the photo was taken. There are shoulder straps not visible on the bottom between the skids. I used 1/4 inch baltic birch plywood with fiberglass cloth/epoxy on the exterior and epoxy sealer on the interior. The shoe box top telescopes to accommodate varying loads.