Hello all.
I have found a few boxes that can be interesting as containers for Survival Kit or First Aid Kit. The brand is "Lock&Lock" and they are boxes like Tupperware, but with a rubber band for hermetic closing and lateral closings for a better adjustment. The model of 360 ml seems to be ideal for a Survival Kit and of 550 ml, for a First Aid Kit. Both are very solid, have good closing and, in spite of his small size, have enough capacity for kits components.
You can see all the products at
http://us.locknlock.com/main.asp