http://www.bikeforums.net/showthread.php?t=391501

tad gear packs
bombproof
modular
versatile
can go from very small when unloaded to very large when loaded with groceries

http://www.tadgear.com/x-treme%20gear/packs%20main/t_a_d__gear_packs.htm[/URL">http://www.tadgear.com/x-treme%20gear/packs%20main/t_a_d__gear_packs.htm"]http://www.tadgear.com/x-treme%20gear/packs%20main/t_a_d__gear_packs.htm



I prefer back packs for an even load on my shoulders but if you're looking for a messenger bag then

pac designs ultimate oversize
massive load carrying capacity
totally waterproof
bombproof
the couriers' favorite

http://www.pacdesigns.com/oversize.htm