Tins are stored in large plastic tubs in a closet. Open tins and baggies in current rotation in a small cooler.
As you said, it's in the baggie, which is inside a jar, so you should be fine. Baggies alone are not enough, but leaving the tobacco in a baggie to store shouldn't cause a problem. If the jar starts to smell like plastic, you can always chuck the baggies.(is there any problem with leaving the tobacco in the baggie?)
I woudn't put pipe tobacco in it either. I'd only put cigars in a humidor. The moisture at which you maintain a humidor (after seasoning it) is too high for pipe tobacco, and if you have any english blends, it'll stink up the humidor. (by stink I mean make it smell like latakia which would flavor anything else you ever decide to put in it).But I don't think that I will actually store the tobacco in the humidor