If you are bringing your phone anyway, might as well use that for your mapping needs?

You can have a backup paper map inked on your skin.

I like to keep my orientering skills sharp, so use a compass and map to navigate. I take my phone with me and it can serve as backup navigation, but I usually just keep it powered off and sealed in a waterproof bag.

I have previously wondered about printed handkerchiefs and bandanas that functioned as backup maps. Invest in my kickstarter!

https://truenorthmapco.com True North makes a great bandana sized map of the BWCA areas.

That's a great idea!

(Mildly amusing, I first read 'printed handkerchiefs and bananas'. Like paint your map on the skin of your apple, or the shell of your hardboiled eggs.)