The backpack/Stool combination is a great deal.  I visit airshows a lot, the venue is usually 'bring your own seating'.  With the Backpack/Stool combination I can take my water and some snacks plus have a seat wherever I need one.  I gave a couple of these backpack/stool combos to two of my brothers who are motorcycle enthusiasts & they love them, they fit on the bike nicely providing storage and a seat to wherever they might be going.
The seat might be small, but it holds me just fine, I'm 6'2" @ 280 pounds.
Good product!!!!!