I've made the switch to a backpack for my tools (the Jeep still holds the bulk as a basecamp and I carry in only what I think I'll need) and now I'm bringing in a big blue IKEA bag for collecting the goodies I find (after misplacing a couple items somewhere in the junkyard on this last trip). just thought I'd share.
(my bag isn't this nice but a guy can dream)
it's big, it's blue, it's made from rip-resistant polymers!
oh, and the handcart for big items.