I love the concept of swag--it makes it a real treasure hunt!
I say "concept" because: I am super-new to geocaching (about a month and a half), and I have only found 44 caches so far (all smalls and micros, and not a one with any swag! Except the one outside the bank that had bank pens in it...)
Undoubtedly part of this "non-swag" streak is location--around here, very urban and busy and not a lot of space to hide larger caches with swag, etc.
I am an adult ( more or less, give or take), and I would totally love to find some swag! In terms of what adults would like, I hope I will cover that sufficiently if I ever find any swag to trade! Right now, I have bulked up on pathtags, some geocoins, and a bunch of vintage tack pins and cocktail/costume jewelry rings that I bought at an estate sale. I'm also packing batteries, coffee cards, and multiple toys.
--Now if I can only find somewere to trade them!
M. (RogueTeacher)