After doing some research, I finally bought a backpack that works well for strict airline cabin size limits, and I wanted to share it in case it helps others avoid mistakes with baggage dimensions.
The bag is the VANKEV Ryanair / EasyJet / Eurowings / Wizz Air cabin backpack (expandable version). It is listed as 40×30×20 cm and can expand up to 40×30×25 cm, with a capacity range of around 24L to 30L. It also fits a 15.6-inch laptop.
For Ryanair specifically, it fits properly inside the airline’s sizing gauge (“blue box”) without issues, which was my main concern.
Sharing in case it helps anyone who is unsure about what actually meets the underseat requirements.
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