Does anyone have any experience with this bag. Can you clip the bag to an ordinary trouser belt, or do you have to buy the Lowepro belt system?
Yes, I have that one. It can be put onto a normal pants belt without taking the belt off. The loop on the back of Lowepro S&F items are narrow so works nicely even on a curved belt: it doesn't force the belt to flatten behind it.
Check out the larger StuffIt from ThinkTank. I like it better, but this one is larger.
Yes, you can attach it to any belt.
Take a look at the product page here:
in particular the product images, and the one that shows the velcro strap at the rear of the pouch.
I don't have this pouch in particular, but I have another of the Lowepro S&F series pouches.