We designed the Lotus Crib to fit within the carry-on allowance of most US airlines.
Both the Lotus Crib and the Lotus Bassinet conform to the FAA's carry-on specifications. You can learn more about these here.
(Please check directly with your airline to find out about their carry-on allowances as measurements can vary)
With the mattress surrounding the frame within the backpack, it's also perfectly ok to check the Lotus as baggage.
If you're checking the Lotus, make sure you tell the check-in counter that it is a baby crib, and they should allow you to check it for free.