We present for your use these optional, removable internal frames with aluminum half stays for the Addax 26 and Addax 31 roll-top packs. The Addax 26 and 31 can get pretty big and carry a whole lot! If you're wanting to put some weight from those bags onto your hips instead of your shoulders, using the frame sheet in conjunction with the 1" Padded Hip Belt can help save your shoulders some stress. The frames are made from die-cut 0.55" thick High Density Polyethylene (HDPE), with a nylon webbing sleeve sewn down the center that encases the 1/2" / 13mm wide 6061 aluminum half stay. We've bent the stay to a generic spinal curve, we recommend you re-bend and/or adjust the curvature to best fit your own back (see here for instructions). If you just want a frame sheet, the stay is removeable, though it's worth noting that a frame sheet sans aluminum stay does just about nada when it comes to shifting the weight of the pack onto ones hips. (Read more about that here in our Guide to Backpack Frames).