Three key features I love about this pad:
1) Three panel folding
2) Wrap around style closure
If you have ever had a extra-large pad you have loved it, but the one thing you didn't love is trying to stuff it back into your hatch back. The three panel folding design eliminates this issue since the surface area of the pad when closed is greatly decreased.
The fold over closure creates a nice hammock style carry for some of your larger gear making this packing up or moving locations a lot simpler. I cannot tell you how many times I have stuffed items in my pack only to have it fall out the bottom as I hike and then I have to go back and find my damn left shoe.
POCKETS!!! Stash your guide book, or wallet, or trail mix. I don't care, stash something!!!!