First one I had was a one-wheel torture machine by Warren and Swett. About killed me.
Next I bought a Non-Typical folding back pack cart... not light, but with the angled wheels, you can side hill with a heavy load... big wheels help too...over logs and such.
This one has fabric over it as a sling and since, the light weight one Prejeans made was just tubular alum... lighter.
Since he licensed Ameristep to make his stuff, don't know if that cart is in the line up anymore.
I've used it to haul in gear and then haul out deer.