As seeker said. If you find that you don't have to air it up too often, and you know you'll be going through towns that might have bike shops every week or two, I say just stop in at the bike shops and ask them if they'd let you use one real quick, or top it up for you. You'll also get the chance to maybe see some cool local shops, they might enjoy hearing about, or at least seeing someone out on a cool bikepacking adventure, etc. It's always fun to stop somewhere with bikes or beer.