For the longest time I’ve kept spare Ziploc bags in my geocaching pack. I would replace the broken ones I frequently found geocaches. The other day I found a cache with a soaking wet logbook even thought it was inside a plastic bag. It seems that it’s easier for water to get into a bag with a hole than it is for the water to get out.
So why do geocachers put logbooks in plastic bags? I’ve stopped doing that. I would much rather use a watertight container to keep the water out than to rely on a Ziploc bag. A combination of Rite in the Rain logbooks and a watertight container will ensure that future geocachers find the logbook in good shape.
Here is one tip we can all implement: don’t put the writing instrument in the bag. The bag is there to keep the logbook dry, not the writing instrument. Pointy pencils and dull pens will both easily puncture the thin plastic bag.