We use these binders in large legal cases. They are sturdy but not heavy. They hold up well and store well. My only wish is that the 1.5" and larger have a bit more reinforcement in the front and back covers as the weight of the contents can bend them. Otherwise no one has anything better going especially as light weight.
I am taking a CompTIA A+ certification course. So far I have purchased seven (7) binders ranging from 1/2 inch to 1.5 inches in order to organize my study material. Each page is inserted in a plastic sheet protector.