Originally Posted by bwinters
A word of caution on the MR Popup 38 - it seems the bag can't/won't cinch tight to the frame with less than a full bag. I had a PU 28 and liked it well enough but it didn't anything my Exo K3 can't do better so I sold it.

That’s strange. I had an 18 and now have the 28. They both cinch down fine.