Found these handy and inexpensive containers at the Container Store. Good for smaller <3" diam. soap pucks. (VDH,Conk,Institut Karite fit these) Also good for grating samples.
http://www.containerstore.com/shop?productId=10030953&N=&Ntt=Tins
http://www.containerstore.com/shop/kitchen/foodStorage/leftoversPlastic?productId=10014891&N=74063
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A couple of questions about the tins. What size did you get? Also are the lids a screw-on or a push-on type. Looks like push on. If that's the case, how tightly do they seal, and how easily do they come on and off?