Got some attachments, some baggage I'm actually working on leaving
Macklemore is saying that he has some things that are holding him back and weighing on him. He is saying he is trying to escape this but at the same time he is making a play on words by saying he is packing up his his baggage so he can go somewhere.
Releasing oneself from “attachment” is also central to Buddhism and other spiritual philosophies. Macklemore is trying not to have expectations and desires that relate to worldly matters beyond his control. He believes this to be a path to liberation.
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