Originally Posted by
PAX_fips
And really consider a cargo bag, which can be used as a light raincover, too.
Ah yes, sideways wind-driven rain, and rain dripping down collar behind backpack, and ...
When trip date gets close, check something like
www.wunderground.com for weather forecast for your various destinations. If rain even hinted at, consider this:
Throw some papers and a couple sacks of flour or similar in the backpack. Something in all backpack and other pockets you plan to use. Go outside. Stand under a sprinkler or get somebody to hose you down. See what gets wet.
Rework plan as needed.
Some ponchos are big enough to go over head and over backpack. Then a billed hat under the poncho will keep your face clear.