Laptop + charger
Phone charger (USB-C + old Lightning, in case)
Wired earbuds
Bluetooth dies on planes when you need it most.
Wrinkle-free button-up × 2
Trousers (the ones you wore)
Underwear × 3, socks × 3
Toothbrush + travel paste
Solid deodorant
Under 3oz and won't leak.
Passport or ID
Noise-cancelling headphones
No toiletries kit, no extra shoes, no "just in case." You're back in 48 hours.