I got into one bagging a few months ago after looking at Pieter Levels blog post about it https://levels.io/carry-on-world-travel/ and have been operating from one since the 15th of April.
Bought a minaal 3.0 Cary On after going through the r/onebag community. Also bought some more equipment like an anker power core. Have to do a wash cycle weekly. A down jacket hangs off the bag. A laptop, kindle and my phone are the only electronics I have.
Works very well but in Europe you have to pay for carry on on a lot of airlines and otherwise you can only have something that fits under the seat in front of you.
The minimalism makes life easier. Only one pair of shoes & a pair of flip flops. Depend on the hostel / airbnb to provide a towel. Like Vitalik I have a weeks worth of clothes in the bag and one me.