This is a fun boat that will float and hold something. You use the flat rectangle and slide it in for it to be closed. Also you can store something in it too. On land it can be a secret compartment. Credit to "rivel" "https://www.thingiverse.com/rivel/about" for the original boat. Also in the photo it is smaller than the download size you can always make it bigger or smaller too. Finally this is a fun print that I would recommend.
Glow in The Dark Blue
You could try supports for a better outcome.