I have never used these but I did fish one of the OBF qualifiers with someone who used them. I really like the way the fish stayed calm and it made culling real easy. The gentleman I fished with knew exactly what the bags weighed when wet and he just subtracted that from the weight of the fish. I think I may have to take a trip down to Ed's and pick some of these up (along with a bunch more stuff I don't really need:roll