For a cheap pack I see lots of old frame packs at the second hand and outdoor consignment stores. Usually under $30.

I carried tubular web for a long time. Good for a deer drag and also an outside the boot support for a twisted ankle. Now I go a bit more ultralight and carry a piece of mule tape.

My wife's ski patrol chair lift evac kit was the 1" tube, about 70 ft of 6 mm prussic cord, and a locking carabiner. Fit in her first aid fanny pack.