Saw this and did not have the container mentioned in the description so i pushed some threads and a bottom lid into the frog and avoided having to buy anything.
Log space is fairly short. probably 10-15 mm (1/2") or so.
printed in abs to facilitate standing up to outdoors weather.
frog_geocache (1).stl is a new version with the magnet hole filled in and a spot for tethering the frog with either a zip tie or monofilament
update : i made a new bottom with finger grips