The items that you're allowed to use as underseat luggage vary between different airlines. Generally, you can use [amazon ...

The Coowoz carryall has a USB charge port, adjustable straps on the sides to keep it compact, padded shoulder straps, and a ...

Most (but not all) Scandinavian Airlines fares allow you to bring one traditional carry-on bag, plus a personal item, which SAS calls an "underseat bag." There's one exception: Passengers ...