While the black material is thick, there is no plastic covering on the inside that goes over the top of the drawings. If you put your blueprints on a damp surface and then rolled up the guard, your prints would get wet. The label on the outside of the roll was sewn in crooked and was sharp at the edges. Overall it is a very poorly made product for the price.
I bought this as a gift for my husband and he was disappointed when he opened it. With the poor quality combined with the 30% restocking fee for a return, I would not recommend purchasing this item as a gift.