The 11th Century has been a fairly good answer so far. So has "I'm a Viking."

[Being clad in extremely well-made leather armor had also helped people peg him as being pre-plastic. Or possibly a LARPer, but nobody had made that assumption yet.]

Good thing about being in a group is that there's enough different so that nobody has to know how to do everything. You're going to need to learn how to survive in the wilderness eventually, but there's a safety net here until you do.