the haz-mat fee ($20)is based on ONE container/box... so if you order to big a batch you will eventually get a second haz-mat fee. Ex- you may order 12 lbs and get ONE fee, then order 13lbs and get TWO fees because that extra lb has to be shipped seperate from the others. I think, dont quote me on it, that the limit is 16 lbs UPS could answer it for sure. I did just order 8lbs of APPffg and a box of 500 of remingtons new clean primers and one haz-mat charge was all that applied.