Have you checked out "Beyond Your Backdoor"? It's a nature store and a new division of Lesser Jewellers.
These generic waterproof log sheets are made with Rite-in-the-Rain waterproof paper and printed with waterproof ink.
These are the best log sheets to use in your micro caches. They roll up into a film canister or bison tube.
Dimensions:
Nano - 0.25" x 9.75"
Micro - 1.25 " x 9.75"
Regular - 2" x 9.75"
Bolt - 1" x 8.5"
"Rite in the Rain" brand all-weather cardstock/paper is designed to shed water in any weather condition.