PSI GBFCT 40 lbs Non-Woven Gravel Bag - This 8 oz. Non-Woven Gravel Bag is an all purpose sediment control device. It is filled with 3/8" natural pea gravel at approximately 40 lbs. per bag and sewn shut eliminating spill-out. It is manufactured from machine-cut 8 oz. non-woven geotextile material and sewn with a 4 thread lockstitch hem using high strength, marine-rated poly thread for durability.