[lyndonh]

This.

This is what causes at least 50% of queues. Everyone can take 1 small bag. Nothing on wheels. If you can't lift it above your head it's too heavy. No exceptions. Overhead bins will be sufficient, no hunting around for a space, easier to get your bag at the end of a journey.

On the other hand; I have taken a 35 liter backpack on many trips. No waiting at the carousel to get my suitcase; just walk straight out of the airport.