+1 for "the Bug"
When I first got it, I could not believe how much room there was inside.
I have these old Kirtland Panniers that are on a hook in the garage because my bike now has "the Bug". My old panniers were great, so this Bug is a pretty damn good backpack/pannier in order for me to put away my good ole Kirtlands!
I do like the Helmet pouch also. The side pockets are good for holding gloves and water bottle when you are on foot. There is an inside pocket great for a Cable lock or a U-lock.
When I got mine, I sprayed the whole thing pretty well with Coleman Water Repellent. I have no need for the Rain Cover they offer.