How to transfer my Xbox 360 minecraft worlds to Xbox 1?

Tomorrow I am trading in my Xbox 360 and I want to transfer my minecraft worlds to my Xbox 1 that I will get tomorrow. I know you can upload one world at a time but I won't have my Xbox 360 and Xbox 1 at the same time so I won't be able to do that. I have my worlds saved to a flash drive but I don't think that will work when I stick the flash drive into my Xbox 1.

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