Found out my PO-Box is closed until next week. Which sucks because I placed a domestic order yesterday and wasn't aware of this.
However, my slight concern is how long can Mylar bags last without giving any smell? Will four-five days be ok?
Looks like my t-break will be extended until the new year, not a bad thing I suppose :/
You're good. There's a reason good helium balloons are made of mylar and not rubber. The gases inside can't permeate the mylar barrier unless there's a hole (like the balloon's filling hole if you wondered why they deflate eventually).
Mylar bags are also used for long term storage from moisture in a lot of legitimate products.