I like to be prepared for most situations, so this is the stuff I have in my backpack every day (top left to bottom right):

• Two USB cables
• USB charger
• Pen
• Deodorant
• Tissues
• Radiacode 102
• Power bank
• 2x USB C to A adapter
• USB condom
• Some emergency cash
• Tape
• Flipper zero
• Multitool
• Mints
• Desinfectant
• Wurkkos FC11C flashlight
• Hair ties
• Airtag
• Earplugs
• Sunscreen
• FFP2 masks
• Disposable gloves
• Some meds / band aids

Additionally in my pockets:

• Keys
• Wallet
• Bluetooth earbuds
• Phone