Instruct: Classify an Amazon review as either positive or negative.
Query: Great for personal water craft and large rafts

We purchased this to anchor our "floating island." It worked great. It is easy to fill and keeps the raft in place. The only complaint is the top doesn't cinch down real well and thus you can lose sand and rocks out of the top when the waves push on the raft, causing the bag (anchor) to pull and tug.