That it has a magnetic closure and just takes 2 seconds to take off and replace under the saddle.
How often are you opening your tiny saddle pack that this is a hassle?
If I'm opening my saddle pack for anything I don't want to be pissing about taking the whole thing off do I? Magnetic closure is what I was missing. Still a pointless step but not a deal breaker if you want hipster bags. :P
Why do the straps go around the zip? That seems dumb. What am I missing?