If your backpack's external frame died years ago or if you found a cheap ALICE pack on Craigslist without a frame, you can easily make one with around $3 worth of PVC piping and fittings. The only ...

Its frame is made with 6061 aluminum and it has a “sleeping bag sling,” which looks like a small hammock hanging on the bottom of the pack. Why go external? Cheaper price is a good place to start.