The phrase "hand baggage" refers to small bags or luggage that passengers are allowed to carry onto an airplane with them. It includes items that can fit under the seat in front of them or in the overhead compartments. Full definition
If, on the other hand, you're traveling with hand baggage only, this could be useful at peak times. (travelingformiles.com)
If the free hand baggage allowance is exceeded in terms of number, dimensions and / or weight, the fee for excess baggage will be charged. (airdolomiti.eu)
A maximum of 2 bags is allowed, as well as 1 small piece of hand baggage at no extra cost. (acprail.com)