Oh man oh man oh man.
I have bag lust BAD. For years I've been avoiding plastic/paper bags when I shop but I don't always have the right bag in my trunk to hold all the groceries - or lug them up the stairs. My usual messenger bag holds enough for one meal, but not for a week of groceries. The last bag I used fell apart after one use. Wig, a Chicago-based custom messenger bag (and knickers and backpacks and whatever suits their fancy....) manufacturer run by Wendy and Isaac, has been offering a super-deluxe heavy duty grocery bag on their website since March of 2007. I nabbed the photo below from their flickr photo stream. Bags start at $75 (I imagine if you want it customized it may cost a little extra. But I just made that up, so I could be wrong).
The bag comes with handles and an over-the-shoulder strap for easy portability when going up and down stairs, or filling with groceries as you stroll the aisles. The bag isn't meant to be used in the same manner as a messenger bag - it is a bit long to work on a bicycle.
Of course, the messenger bags are amazing. You'll have to check them out on the website.

