I find that flat cutlery trays for commercial dishwashers work fine. They
have an approximate 1/4" mesh with built-in inset handles and nice sized sides
(large artefacts won't fall off). Since they are stackable you don't need a
shelving system, which comes in handy when using them in a field laboratory.
For small finds I would line the trays with nylon fly screen.
Jeanne Harris
Urban Analysts
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Sydney NSW