Volume matters as much as weight
Light jets have small baggage holds, and the door size can rule out large hard suitcases. Midsize and large cabin jets have noticeably more space.
Special items
Always mention golf bags, skis, pushchairs or musical instruments in advance. In some models these items only fit in limited numbers.
Prefer soft bags
Soft bags fit into the hold more easily than hard suitcases. To avoid surprises on flight day, state the number and size of your bags from the start.
In the cabin
Small bags can stay with you in the cabin. How much can stay there depends on the cabin layout.