I like to carry a spare, pre-oiled (use motor oil) foam filter with me on long, dirty trips.
I can squash it down into a pretty small and light package in a zip lock bag for packing. Then, pull out the old filter, insert the new and I'm ready to go.
Wash the dirty one out with soap and water or gasoline, re-oil it and store it for the next change.
I have found that a foam filter (Suzuki) can be cleaned with gasoline a number of times before it starts to come unglued.
If I don't want to carry an extra, I just use a foam filter oiled with motor oil, wash it out with soap and water, let it dry a while and re-oil it.
Hint: don't wash it in a hotel room sink. It's bad for the plumbing and you'll never get the sink clean.
................shu
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