UPS and Federal Express, and now the United States Post Office, charge additional fees for large but lightweight packages. The professional term for this is "Dimensional Weight". It has to do with how much space a box takes up on their trucks and planes. Some of our products are very light, such as squeeze bottles, storage jars, jugs, wooden embroidery hoops, and certain very lightweight fabrics on the bolt. Others are bulky, like sweat shirts. When a lot of these go into a box without anything heavy, the weight of the box often does not represent the amount of space on a plane or a truck the box takes up. When this occurs, the shipper calculates what the package 'should' weigh, the Dimensional Weight, and it is charged. What's the bottom line here? Basically, if you are ordering a large amount of products that don't weigh much but take up a lot of space, then the shipping may end up costing more than originally calculated by our website based on the weight alone. When we go to pack your order and see what size box it has to go in, we find out if dimensional weight is involved or not. We will call you if you owe us more shipping for dim. weight charges. Some of the lightweight fabrics, if the bolts result in dim weight, we just take them off the bolt and fold them in a box. So, if it's important to you that they stay on the bolt, please let us know in the special instructions on your order! If you have any questions about shipping charges or whether your order might incur Dimensional Weight charges, feel free to call our customer service department.