Great for hidden ballast
I wanted some extra ballast, but wanted it all hidden. I already have plumbed-in sacks in the v-drive lockers, factory tank in the ski locker and a v-shaped bag under the bow seats. I thought about lead, but it's safer to have the neutral buoyancy of water. These little bags are small enough to fit under my wrap-around seats, the storage space under the glove compartment, under the dash, etc. I bought 4 for an extra 600 pounds of ballast. I'm happy with the wake, and my wife is happy to not have visible fat sacs sitting all over the floor!