 Re: polybag thickness
I think there is a noticeable difference.
Personally, I like the 2mil better. The 1mil kind of feels like saran wrap to me and I get a "cheap" feeling anytime I get something in the 1mil.
The price difference isn't that much, and I think every little bit counts.
I think it also depends on what kind of shirts you're shipping. If you print custom orders for customers, and you're shipping them their order, I don't think it's a big deal.
On the other hand, if you've got your own brand, site, etc. and you're shipping those shirts to individual customers, I think the thicker 2mil is better. Also, if you've got retail accounts and you're shipping your branded shirts to a store, I'd go with the 2mil in that instance also. | 
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