Barker's Latex Pan & Trap covers are thin and lfexible, and are free of human scent. They keep dirt form getting under your trap pans, and keep water out of your traps' firing parts, so that they don't freeze and stop working properly. Come in packs of 24.
 
They are available in five sizes.  The smaller sizes are pan covers and the larger sizes are full trap covers.  The sizes are:
4"x4" pan covers for #1 & #1 1/2
5"x5" pan covers for #2's & up
6"x6" trap covers for #1 & #1 1/2
7"x7" trap covers for #2's & up
8"x8" trap covers for #3 & #4