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In our local hardware shops, we can buy Tupperwear-type containers called 'Lock and Lock'. As the name implies, the top locks on with a positive lock on each of the four sides. There is a huge range of sizes and all the tops come with a rubber seal to keep nasties out (or even in!). You may have similar items in your area.
Regards,
Ian Thomas
(who is still waiting for his CyBook!)
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