I keep a pop-up camper parked permanently on land near an 800-acre lake. I use the camper at least 20 weekends out of the year. It used to be a hassle to load and unload my dry food goods (rice, flour, pancake mix, navy beans, potatoes, etc) with each use. The mice are quite thick in the area and the dry goods are always at danger of being invaded.
A friend turned me on to a device that has made life much easier. It’s an anti-rodent food bag called Grubpack. It is largely sold to hikers and backpackers, but also serves my camper purpose.
It is made of a metal wire mesh material which the mice can’t bite through. Grubpacks are sold in various sizes online. I have a couple small ones for the boxed goods and a large one for my potatoes, onions and other loose raw fruits and vegetables.