I've had the Pipsqueak for a couple of years now and absolutely love it. It's the perfect size for my wallet, keys, and a garage door opener. I got a custom color to match my Messenger 2.0 bag. When I arrive at a location where I don't want to keep the Pipsqueak on my bike I simply attach it to the bike loop and it fits right in. For longer day rides I throw a few Clif bars in it and I'm good to go.
I received my pipsqueak bag about a year ago. It has been a great addition to my bike, giving me a place to throw my phone, keys, wallet, etc. I got fabric to match my Commuter 2.0 bag. Fantastic!