The bins are not “normal” (Airbus) size - but they’re not absurdly small. I travel with a fully loaded Clas Ohlson 38 litre backpack (one compartment for clothes and one for business materials) and it fits. There will be the option to gate check larger bags, leaving them at the foot of the airplane steps and collecting them right there on arrival. (I.e. gate checked bags will be hand loaded and don’t get sent through the airport to baggage reclaim.)

https://www.clasohlson.com/se/Ryggs%.../p/Pr317183013