USN Bag is a bit of a different monster. Has a really large base so the rocks resemble a smaller, ball-shaped canvas bag to lift. No grip slip. Really good bag for lifting.
This Sea Bag is a different monster. the saco de estanque was a lot smaller space wise. It resembled a smaller heavy bag when filled. The USN bag has a really large base. There is much more space in it (more room for the rocks to slide around) which makes it so much more difficult to get into position.
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