If it was free and minimal bother, I'd put some clothes and spare parts and tools I didn't choose to haul on the bike. There's usually a lot of crap that you "might" need, but don't carry because you don't want to pedal an extra 50 lbs all over, and that's what drop bags are for.
__________________
"be careful this rando stuff is addictive and dan's the 'pusher'."