Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Rugged but smaller than advertised

First, this thing is built. It's four parts: stainless steel screwcap, stainless steel capsule body, steel triangle ring, and a rubber o-ring. The cap and the body are each milled from single pieces of stainless steel - there are no glued end fittings, or joints that could debond or leak. This probably could have kept pills dry after being pulled up from the Titanic. It has no paint or surface coatings to fleck off and contaminate your drugs. The one downside is that the interior diameter is 11.5 mm (measured with calipers), not 12 mm as advertised. 12-mm diameter tablets, of which there are many, will _just_ not fit. It can fit one 1,100-mg fish oil pill and many others, but measure your meds to make sure they're at most 11-mm wide. My prescription medicine (a fairly common one) was 12 mm. Otherwise, a perfect pill fob.