Just a logbook in a flat container that could hold a small item but didn't at the outset.
FTF: marcipanek - Congrats!
Close second: callily02
This geocache is part of the Gulf of Maine Council Geotour across Nova Scotia, New Brunswick, Maine, New Hampshire, and Massachusetts. You can earn a limited edition geocoin for accumulating 100 points in the tour. Details for the geotour can be found at the GOMC website. To play, download the full geotour passport.
The "mitten crab" containers have run out after three replacements of the original, but a similar container was deployed on this cache's 10th anniversary. Let's hope it holds up to the harsh environment and stays waterproof.