Leatherman metal bracelet with a lot of tools on the wrist. Not only it is strong and sturdy, but also looks cool. Also, saved me from being completely locked inside a room with no one around cause the door handle decided to break. Quickly disassembled the locking mechanism with the bracelet and was free in 2 mins, lol. Leatherman might be on an expensive side but there sure are alternatives. More than that, somehow I never had any issues with airports. They literally let me take it onboard every single time.
Phone holder for bed, aka robo-arm. Watching content before/while sleeping has never been more convenient.
A waist bag. No more stretched out jeans cause I keep all my stuff in the pockets.
A gas lighter. Works as a candle substitute if necessary. Also stylish.
A small but reliable kickscooter might be a great option if you need to go some distance that’s too long to walk and too short for a taxi drive.
A second usb-c charger for the laptop actually is a convenient thing if you need to carry the laptop across rooms. No need to carry the bulky charger every time.
Speaking of chargers, consider buying a lot of 2 or 3 way wireless chargers for your mobile devices. I don’t remember last time I bothered with plugging in my phone cause it’s always charged wherever I go due to having wireless chargers everywhere.
On an expensive side, but a good sturdy metal gaming chair.
A portable SSD. Saved me by having all my backups many times.
A usb-A and usb-C compatible flash drive.
Paper cups and plates I guess? I don’t like doing dishes and those two both eliminate the need to, but without a downside of being plastic.
Gonna sound strange, but a ladder. Replacing burnt lightbulbs with a chair is a nightmare, at least in my house.