On your reservation there should be a link for you to check luggage restrictions. Definitely check if you don't know. They are pretty standard I believe but I would check anyhow. They all have different Weights they allow.
It depends on the airlines.
Dwayne is right. Google tje airline you are using. Besides weight, there's size maximums for carry on luggage.
Literally every airline has their own standards and those are subject to who you are to them i.e. economy may get a 5lb limit but triple Platinum preferred diamond customers may get 100lbs etc
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