This has passed the test of time (30 years approx) for someone interested in "heavy" or sometimes "painful" loads. It is a bare frame with a shelf (nylon fabric from main frame to bar attached at the bottom of main frame) that "flops open". Add on some D-ring to the pins (have a few extra pins too for the heavy load days) and straps. Away you go. Put on whatever you fancy. Care in loading up though. Ideal load is heavier higher and ligher lower (heavy low and you lean too far forward, too heavy… Full review
Trailwise made outdoor gear from the 1950s to early 1980s.