Interesting. I once had something similar made for my 8x10 by a local mountain gear custom service, now out of business. But I have carried Sinar 4x5 monorails thousands of miles in the mountains in classic external-frame packs, along with all the other necessary gear and supplies. Now that I'm in my 70's, I mainly used a lighter little Ebony 4x5 folder on long mtn trip, but still prefer Sinars or the 8X10 for day hiking.