The small stuff that actually makes travel easier. All under $25. Most under $15. The kind of thing you don't think about until you don't have it and then spend the whole trip wishing you did.
The paper ones that come with bags are useless. A silicone luggage tag that actually attaches securely and has a privacy cover for your address is the replacement. Bright-colored ones also help identify your bag on the carousel at 2am when you're exhausted.
If you're checking a bag, a TSA-approved combination lock is the one where TSA can open it with their master key if needed — meaning they don't have to cut it. The ones without TSA approval get cut off when TSA needs to inspect a bag. The Master Lock TSA-approved option is $12 and has worked without issue for years.

Hostels charge for towels. Hotels provide them but they're heavy and you can't pack them wet. A quick-dry microfiber travel towel packs to the size of a paperback, dries in 30 minutes, and is the most useful thing you don't have. The Rainleaf is the category winner — absorbent, genuinely quick-dry, comes with a snap loop for hanging.

Reusable velcro cable ties are the solution to every charging cable tangling situation. 50 of them for $7. Use them in your bag, at your hotel desk, in your car. The kind of thing you suddenly start using everywhere once you have them.

Especially useful for solo travelers staying in budget accommodation. Hangs on the door handle and sounds a 120dB alarm if the door is opened. Deters opportunistic theft and gives you a layer of security in unfamiliar rooms. Weighs nothing. The SABRE Travel Door Alarm runs on a 9V battery and has been consistently reliable.
