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one of these bikeracks attatches to a regular bookrack. you can get them for like $7 at the flea market. they fit a paper grocery bag pretty welll...
you can stack a a bag in there and then stack more bags on top of it with bungee cords and any extra shit you cant fit on top of that, just slap into a backpack... ive carried some pretty big foodbank hauls this way.