A Pentomino Pocket Puzzle

thingiverse

Here's a small square box, containing six pentominos - three already inside and three more waiting to fit perfectly into their designated places. While not an overly challenging puzzle, it does offer some interest as there are actually three distinct arrangements of these pentominos that can cover the entire box without any gaps or overlaps. One of the nice things about this puzzle is its portability; a simple crossed rubber band can be used to keep all the pieces securely in place.