Recommendations for leak proof containers?

I hate storing food in plastic, so the best option I found and use myself is http://www.bedbathandbeyond.com/product.asp?sku=112870 which does have a plastic top and silicone gasket but is otherwise glass. Been using for 3-4 years and love them. No leaking problems.

I have found two types of containers which work for this. First, there are containsers as lemontwist recommends, where the body is either glass or plastic, but the lid has a gasket and a secure-closing system which prevents leaks. There are multiple brands which sell them. Second, for such small sizes you can use a jam jar with a screw-on lid. Both work really well, but you might consider placing the whole container in a small plastic bag in case you don't seal it properly before transport.

Not sure where in the world you are, but an excellent leak proof system is made here in New Zealand called Kip It by Sistema

What makes them good for your purpose is that they have a proper gasket with a 100% seal. The gasket can be simply removed from the lid (pop out with a toothpick) for proper cleaning

You can find it online on the local trade site in NZ dollars, or Google your own country for a supplier?

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Note: I do not work for Sistema, just a happy customer

I am going to answer my own question. Many thanks to all who offered suggestions.

We bought a pair of 470mL (15oz) plastic containers from Lock & Lock.

They were a reasonable price, made from plastic (I didn't want glass owing to the risk of shattering during transit) and I can confirm, leakproof.