If you have someone collecting your mail for you, or sign up with one of the several mail forwarding services, you can have them periodically forward your mail to you in a single package to either the park you're at if they'll accept it, or to general delivery in a nearby town. Smaller to offices are best for that, since larger cities may have several branches, but only one that accepts general delivery. It can also be shipped by UPS or FEDEX of course. Before you head out, move as many bills, etc., as possible to online billing and/or automatic payments. Most banks have online bill payment systems that can also be helpful.