Last week I needed some throat lozenges, and came across "Sootherbs ZINC cherry flavored lozenges", which came in a nice plastic box. The box is made of a rather sturdy red plastic. The inside dimensions showed it to be the same width, 1/16" shorter, and 3/8" deeper than an Altoids tin. When closed, the seam is flush with the sides of the box, which would make it easy to seal the box with tape. A nice box for a small kit, with a bit more room than an Altoids tin.