As always, our postage estimate is high (we never know what size/shape the total items that your cart may contain, which affects shipping cost).  If you're JUST getting this silk pack, we will send it First Class Mail (aka "Ground Advantage) with tracking. 
Before all the changes in how US Postal Service calculated rates, I could provide a maximum amount.  But now rates can exceed $8.50 on the continential United States, depending on how far away you live from a major postal distribution center.  As always, after your package has shipped, a human (me) will finalize your "pending" credit card charge to reflect the actual postage cost. We always pass along our exact postage cost-we don't make money on shipping.