My blanket is primarily to sleep under at hotels because their comforters are typically too hot for me and many no longer have available a conventional light blanket. Just easier to carry my own and useful for emergencies.
I always have a windproof and water-repellent fleece with me. Windproof because one of my reasons for carrying it is that in my preferred aisle seat on some 737 aircraft means the main airflow is going to be blowing on me and can, to me at least, be too cold at times. Without a barrier, fleece is useless. It also means I don't have to carry a separate windproof/waterproof layer for most trips.
USB hub is more compact than individual transformers, but I always have a couple, just in case. 2 sets of cables to cover all devices, which I've never been able to standardize on, it seems.
Between my carry-on and rolling laptop case, I carry a lot of crap, all of which have been much appreciate at times. Off top of my head:
8 ft. multi-plug flat wire, flat plug extension cord
6 x USB Hub
2 Fast-charge USB transformers
2 x cords to fit all electronics
Very slim power pack
https://smile.amazon.com/gp/product/B079DGQKS6/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 that I can literally attach to my phone back to charge and use with a rubber connector thingie:
https://www.newegg.com/p/0SB-007C-00019AAAx2 Headlamp
CR-123 x 2 1000 lumen Surefire
2 x AAA flashlight
Well-equipped First Aid Kit
Zip lock bag with all kinds of adhesive bandages
Food - Jerky, self-made high protein trail mix, 2 x Albacore Tuna packs
Folding fork/spoon
At least 1 bottle water (buy on other side of TSA)
2 x 5-Hour Energy
1 x Afrin (emergency use only - hate this stuff, but sometimes...)
Personal Meds
2 x XL Binder Clips with red flag (to close drapes in room)
Spare AAA and CR-123 batteries in holders
Wet Wipes
Back-up Glasses
Sony WH1000XM3 ANR Headphones
Back-up Bose ANR ear buds
Kindle Paperwhite
6-inch TI prybar
Very sharp, pointed 3.5" scissors (trim beard)
pointed 3" scissors (general purpose)
4-way keychain screwdriver
lot-o-earplugs (Howard Leight MAX)
Bandana
1 book Safety Matches
BIC Lighter
Spark-Lite
lot-o-Black 2" Gaffer Tape (wrapped around key cards)
6 ft. Dayglo Green 2" Gaffer Tape (wrapped around key card)
4 ft. 2" Gorilla Tape (wrapped around key card)
9 ft. 1" Fiberglass Strapping Tape (wrapped around key card)
4 ft. 2" Fiberglass Strapping Tape (wrapped around key card)
20 ft. Parachute Cord
Windshield Phone Holder
https://smile.amazon.com/iOttie-Touch-Wireless-Charge-Mount/dp/B0754NDNT8/Car charger
https://smile.amazon.com/gp/product/B01IN0J4QO I am sure there's more, just can't recall right now.
Back to work...