TBH you can use an airtight tuppawear box with a Xikar Dry Mistat Crystal Tube for what you want to do - just open the box once every couple of weeks to let some fresh air in, and keep it somewhere with a stable temp out of direct sunlight.
http://www.cigarsunlimited.co.uk/acatalog/Xikar_Humidiifers.html
I use one for my overspill from the humidor, total cost about 14 quid
@vinylvillain started
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TBH you can use an airtight tuppawear box with a Xikar Dry Mistat Crystal Tube for what you want to do - just open the box once every couple of weeks to let some fresh air in, and keep it somewhere with a stable temp out of direct sunlight.
http://www.cigarsunlimited.co.uk/acatalog/Xikar_Humidiifers.html
I use one for my overspill from the humidor, total cost about 14 quid