The HappiSack is the updated version of the best selling SaddleSack MD. As a life long Who fan I appreciate the fact that the name came from “Happy Jack”. It’s got one less strap, and no kangaroo pouch, but comes in at a slightly lower price. Same size, same great quality and durability.
You need a saddle with bag loops to use this. If you’re not a fan of Brooks saddles, the fix is something like this.
There’s an extra patch of fabric on the bottom of the bag, and a daisy chain of loops in case you want to lash the bottom of the bag to your rack. You may never need to.
I’ve been using these Sackville bags for years, and there really aren’t any others like them.