When I first saw this little item I knew I had to have one. It was small and compacted nicely. I thought it was the perfect option instead of lugging around a full size or even a compact, hard tripod. Boy was I wrong. Look for a full write-up but needless to say it didnt get a passing grade.
Well after a bit of further review I have actually come to like this little gadget. It fits nicely in the Camelback and if you are only using a smaller digital camera it seems to work fine. I used it for the below self portrait. You can see the little rock where it was perfectly perched.
I believe there are three sizes. I have the middle one. The tiny one seems to be too tiny for even the smallest of digital cameras although I never tried it. The larger one seems to be a bit silly in that you might as well carry around a real tripod for that kind of bulk.