I already have the Chrome standard size messenger bag and I love it. I've had the old bag for five years and it looks as good as the day it was new! The standard bag carries my 18" lap-top, a couple of books and an extra pair of gloves. I got the new, larger bag so that I can carry all that plus my motorcycle pants and a sweater. These bags are totally water-proof and comfortable to carry while on a motorcycle. They don't interfere with you looking over your shoulder with a helmet on the same way a back-pack would. After a long hard day at work and at school, I can stop and pick up a twelve-pack of something cold and refreshing.