Nomatic Travel Pack (20L)

Won't lie, many flaws. But great solution for short trips as a single carry-on. Expands from 20L to 30L. Very sturdy. LOTS of storage. Good compartments and access. Well sealed against rain. Good grab handles from all sides. VERY high material quality.

Downside: Very heavy. Can be uncomfortable with a full load. Belt and sternum straps do not help. Outer material VERY tough, but scuffs easily if you care about pristine aesthetics.