Plastic boxes are kind of bulky, although I suppose you could at least nest them together and wedge other items inside when empty.
I had a mouse keep waking me up recently one night snow camping at ~2000m in Yosemite N.P. He/she didn't pose a threat to my tent but kept making noise bumping up against it, scratching a bit. In the morning I found the mouse had tunneled UNDER the tent floor. Maybe it was warmer there? Couldn't get it to leave so I went around and lifted the corner of the tent and it was just sitting there. I picked the mouse up with my shovel and tossed him 10m or so and he just sat there for about ten minutes, looking at me. I went over to check if he was sick, took his picture. Then suddenly he sprung to life, ran in circles a few times and then hopped away to a nearby tree well.
Later, as I was about to ski off, he ran from that tree well right past me toward another tree, making it to underground safety just a few centimeters ahead of a diving Steller Jay.
By the way, I love those bagel crackers... wish we could get them here. I'd have brought a bunch home but they wouldn't have fared well in the duffle bags.