chrome!!!!
I had a timbuk 2 for many years and it was quite durable, but as previously mentioned, it was prone to slight leakage. I've got a chrome bag now and am pretty pleased with the setup and comfort. Haven't put it thru any super wet rides yet, but when it has gotten wet its kept my stuff dry. Your friends may get a kick out of the seatbelt quick release tho too, like pulling brake levers in a bike shop, some people just can't resist pushing that little red button...... Glad they don't have access to nukes, haha.