Before heading off I wash and pull apart the lettuce (or just wash the bagged mixed lettuce which I prefer) drain as best I can, then put into a container (eg systema). I find the lettuce doesn't get bashed about in the container, even though it takes up a bit of space in the fridge. It can be stacked etc that way too. Maybe put a layer of paper towel in the bottom if you're worried about the water - but I find I don't need to do that. Hope this helps, have fun!