I have a Cozytouch one - I too found grobags a bit expensive. The zipper is plastic (whereas I think the grobag ones are metal) - so I guess eventually it will wear out - but it seems to do the trick for now. The only criticism I have of the Cozytouch ones is that the designs are not as cute as the gro-bag ones (but for less than half the price, I can put up with that!).