30 liter backpack. Wearing one outfit and carrying two outfits in the pack. A little hand laundry every day or two.

Less stuff, fewer worries. This is as pared down as I want to go, and I can travel indefinitely with it.

Everyone needs to work out the best system for them, and they are all going to be different.

@hsl I never heard about this term until now, but I can give an insight on what do I usually take in my backpack whenever I leave the house for a longer trip:

• a compact umbrella
• some tissues
• a powerbank for my phone (despite nowadays my phone battery lasting more than a day and being replaceable)
• a pen
• a 0,75-1l bottle of water

All these usually fit in a small backpack like mine just right.