I'm running a store at http://www.spartantraininggear.com/shop/ which utilizes UPS and Canada Post as the shipping methods. Most of the items ship in boxes, so for those, the shipping is calculating more or less correctly. However, there are two or three items (t-shirts and stickers) which are shipped in envelopes, therefore do not really have dimensions in the same way as the boxes do. And the shipping calculations are really blown out. I'm not sure how to handle this. If anyone can please offer some advice, it'd be much appreciated.