There are a number of options for sealed environments. Rubbermaid and other man ufacturers make some wonderful containers for the restaurant trade in polyethyle ne, polypropylene and polycarbonate. These range from .5 gallon rounds to 5+ gallon rounds and even larger rectangular tubs, all with lids. A closed cell ga sket would be necessary for the rectangular boxes, but many of the rounds are ai r-tight. If you use a gasket, you will also have to devise a compression device such as a bunch of small C-clamps, screws and wing-nuts, spring clamps or whate ver works. If you are using silica gel as part of the environmental control, be very carefu l that you do not allow it to run away on the high-RH side. It can easily do th at unless it is monitored very regularly and frequently. Another alternative is to make a box from plexiglass and incorporate a flange to receive a gasket and a flat lid. Again, closed cell gasket and some sort of cl amping arrangement is necessary. Plex allows you to examine the contents without opening the environment, but it means some fabrication work. Polycarbon ate boxes are also transparent and allow you to view the contents. The simplest solution would be the polycarbonate rounds with tight lids - if they fit. Good luck. Call me if you need more info/advice. Geoffrey Brown Kelsey Museum University of Michigan 313-747-0439 [log in to unmask]