I was looking for a small messenger bag that I could use instead of a purse on bike rides.  Something big enough for my iPad, a bottle of water, my wallet, my phone, and maybe a few odds and ends that I might pick up here or there.  The extra small size is perfect for that.  The only negative is the odd strap.  First, the extra small is so small that you will not need a shoulder pad on the strap.  It looks funny.  I removed it right way.  The strap is designed with this built in loop on the side that buckles in so that once you set the length you can just slip it on and buckle it instead of having to readjust it each time.  I'm sure that is a great feature on the larger bags but it is silly on the small bag.  I wish I could remove it.  In order to wear it cross body it always needs to be fully extended, that permanently looped up bit of strap would be nice to use for further extension.  The khaki and plum colors are very striking.