We've mentioned on the forum how the annual membership renewal in many earth-friendly organizations include freebie bags and flashlights etc. that can come in handy on travel. After a few years you accrue all the renewal gifts and have to find new uses or give them out to others.
I'm just now working my way out of the headlamp and messenger bag groove with Sierra Club and got instead their reusable produce shopping bags for this year's free gift. I pull these out of the mailer and darn if they aren't the spittin' image of the RS handy mesh bags that come with the luggage orders!
https://store.ricksteves.com/shop/p/small-mesh-bags
The Sierra Club set includes one small, two medium, and two large. Sweet.
What's been your favorite freebie to add to your packing arsenal?