“What are bar tacks? I thought they were the metal rivets at all stress points that most Carhartts have. The product description for these jeans says "loaded with bar tacks". There are none on these pants. Is this a defect or did you change the design and not update the description. These aren't gonna last long without rivets.”
Bar tacks are a sewing process that was used to reinforce the top corners of the rear pockets of jeans. It involves sewing a large amount of thread to an area for strength. You are correct that the rivets are the metal bindings, those are extra reinforcements.