Originally Posted by
rrz518
Common where exactly? Not in the US.
Pretty common in Europe. I checked two carriers that are partners with alliances I fly:
Lufthansa:
In First and Business Class you may take two pieces of hand luggage and their contents on board with you. Economy Class passengers are only permitted one piece of hand luggage. Please check for possible country-specific variations to this general rule.
A piece of hand luggage may not be larger than 55 cm x 40 cm x 23 cm and may not weigh more than 8 kg. Foldable garment bags are an exception to this; they count as hand luggage up to a size of 57 cm x 54 cm x 15 cm.
Air Berlin:
A single item of hand baggage may not exceed 8kg (10kg with laptop) and dimensions may not exceed 55cm x 40cm x 20cm.