I packed a 45L bag for a 4 day Vegas trip in 2019, now my record is 5 days in a 28L backpack
The change came after I watched a guy at the Phoenix airport repack his roller bag at the gate for 10 minutes while everyone boarded without him. What finally made the small bag work was ditching the second pair of shoes and washing one shirt in the sink on night 3, so what's the one thing you refuse to leave behind no matter how small your bag gets?