Often boats kept important papers in waterproof containers so the idea was not that farfetched.

And the first kiln ever devised was not invented for the purpose of making useful waterproof containers.

He had his waterproof container full of matches.

In one hand he now held a waterproof container.

Pitch was also used to waterproof wooden containers, and is sometimes still used in the making of torches.

Put the wrapped part in a plastic bag or waterproof container.

Place the plastic bag or waterproof container on ice.

Separate different waste materials and store them in covered, waterproof containers with clear labels.

So, I packed the radio in a waterproof container, then swam down and stowed it under some rocks.

There, inside the cup of rocks, was a waterproof container.