The set of nitrile gloves is a good call. I’d keep a few pairs available because...well...people goo. Also an N95 or other mask for TB, influenza, and other mystery molecules floating about the pressurized-with-recirculated-air cabin.
My backpack was d-ringed and bucked into the empty seat to my right. Bring it to pack your lunch, a toothbrush, and fresh set of underwear/T-shirt-socks, toothbrush/paste, etc. THAT set of overnight spares got used a lot for weather, duty, maintenance issues. That’s also where my spare charger and snacks were carried.