I was going to suggest Jay Sankey's Omnilope, but that's out of stock. (I don't think it's coming back because it was in the Cool Box for a long time.) But take a look at this clear force bag:
http://www.penguinmagic.com/p/S15739
For the price, you can't go wrong. Uday had a triple force bag for a long time, but I think that' out of production, too.