I was looking for flights from Stockholm to Amsterdam and saw good deals with Norwegian airlines and Scandinavian airlines (SAS). However, the catch is that their lowest tier doesn't include a carry-on bag, only an underseat bag with a size limit of 30×20×38 cm, but mine is a wheeled backpack of 32.5 x 47 x 21.5 cm and it mostly fits under the plane seats. Anyone traveled with them? Are they strict about the size requirements or will they let me pass without any fuss?