Just got in ALMS 12L Tail Bag. Installation on this thing is super simple, but it doesn’t quite work on the tail because the rear of Vit is so streamlined. I plan on ordering the rear bag carrier to solve the issue, but in the meantime I’m using it as a tank bag. You could probably get away with only using two straps on the back without a bag carrier installed, but I haven’t tried that yet.
The whole thing is waterproof, easy to remove, has a nice zippered pouch on the back, and on the front there’s a removable cargo net that’s real handy.