The "bag" style housings are not going to be as leak proof as the solid housings made for your camera. I know the bags are quite a bit cheaper but the last thing you want is a leak. I tend to think the bags are made more for snorkeling than for diving. The deeper you go the more likely it is to leak. The bags have their place. I would use them in the rain, around water where the camera could get splashed, or even for snorkeling.