I have several different panniers, all from nashbar or performance, for excellent sale prices. I have the daytrekker, the MTB, and the grocery panniers. I like and use the grocery bag one the most.

Two simple reasons - they haul most anything, and they fold almost flat when they are empty. They live on my bike almost all of the time. You can pack anything in anything, even in plastic bags, and drop them in. I can easily carry three large grocery bags home, one in each bag, and one strapped across the top of the rack, and I use the rack treunk for cold/frozen stuff. I also carry two reusable shopping bags in the panniers, folded flat, for use whenever I need them. Extremely handy and useful.

I believe they are on sale at Nashbar today, with free shipping for nashbar branded orders. Don't delay.