Extra carry on?

How goes it. I'm taking a flixbus soon for the first time, and want to know if I can actually bring an extra carry on without running into any potential issues.

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I already have a suitcase and backpack I'm be bringing, both meet the dimension requirements. But I have an extra overnight bag that I want to bring and put in the overhead storage. It's about 16 x 12 x 8.

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NYC -> DE on a weekday if that's relevant.

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Very much appreciate any feedback soon.