I bought this case to store some valuable B&W negatives, some of which are deteriorating and giving off bad smelling gases. Competing air tight cases have self actuating pressure releif valves which let the gas enter my storage area in the house. Not good. These cases only equalize when you open the latch so I can take them outside before they vent. This means I can store the cases in my air conditioned house to slow the rate of decline for those valuable negatives. These cases have solved a big problem for me at a reasonable cost. I'll buy some more.
Pros: Air tight, cost effective.
Would recommend: Yes
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