I'm sure this isn't what you're looking for, but I'm totally fascinated with it: http://www.burley.com/products/cargo...ies/travoy.cfm

It's a trailer/grocery cart contraption that seems to carry quite a bit and without much difficulty. Folds up small. My LBS has one. I was tempted. But I don't need it...

I have the basic fold up nylon grocery panniers (Novara, I think). They aren't holding up terribly well (I bought them 2nd hand). They also have a boxy shape that makes heel strike a problem for my DH on his shorter wheelbase bike. I'd rule those out. I also have the Ortlieb grocery shopper. It's small, and difficult to load (but is water proof).