If you've ever struggled to cram everything into your carry-on luggage, you won't want to miss this video. It varies between airlines, but the typical United States domestic flight will permit one carry-on bag and one personal item, such as a purse, diaper bag, animal carrier, or backpack, so there's often a lot of pressure to pack light for a short trip and skip the fee of checking in a bag altogether. (Although as of late, the extreme budget companies like Spirit Airlines have been charging as much as $50 per carry-on bag as well.) It's worth noting that if you are planning on checking in luggage, you may want to strategize between your carry-on and your checked luggage. Checked luggage typically carries a weight maximum of 50 pounds for coach-seat flights, but there is no weight restriction on carry-on bags.