I almost always take eggs on week long summer canoe trips. The plastic egg crates work OK if you are careful but I double ziplock them.
The key is to keep the shell intact. To that end I've bought eggs at a local nature center that operates a small organic farm. Their chickens get a lot of calcium from the plants they forage and the shells are very thick.
Sometimes I've used pasteurized eggs, especially if some of the crew are uncomfortable with the idea.

