In my checked luggage I packed a couple of rubbermaid or tupperware type containers nestled in my clothes for snacks. I also packed 12 bottles of water, packaged in 3's in sturdy ziplocks. Then I wrapped air-filled plastic packing material around them, and used that also to surround 10 packages of mini muffins. All arrived perfectly, we ate the food, threw away the air-puffed packing material and had extra room for stuff on the return trip.