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- keys: very handy for when you need to unlock the door to your apartment. If you add car keys you can also drive somewhere which is very helpful. I use mine pretty much every day
- cellphone: it's like a multitool with a camera, flashlight and a phone. If it's a smartphone you can all use it to access internet. Save my life many times when I was bored and had to look at some videos online or check the news
- wallet: great for carrying cash, ID and credit cards. It's good to have your ID with you when people ask for your name but you live in a foreign country where no one speaks Polish. You can use cash or credit cards to buy other stuff you need like a bottle opener
Not quite the spirit of what I was asking for, but upvoting anyway cause it reads like item descriptions you would have seen on r/outside lol.
Multi tool wallet or include a multi tool credit card in the wallet. I have a wallet that is two pieces of metal with a rubber strap holding it together, with 2-3 cards in between. The wallet has a frequently used bottle opener and a pointy bit meant for screws that I use to cut tape.
Keys for opening doors, driving etc. Also for defense…My brother got jumped by a group of teens in college. They came up behind, shoved him down. To defend himself, he pulled out his keys and slashed one in the face. They didn’t expect him to do that and took off running. They only got a cheap phone from the ordeal and not his backpack which had expensive books and a laptop in it. I always have my keys on me now.