I just bought a similar product by Hydro Farms, called GROW IT Super Course Perlite, in a 100L bag, about 3.5cu ft. It's the best I've ever gotten. Purchased at a hydroponics store in N. Jacksonville. There's no size mentioned on the bag, but I called the store, and they said the particle size on mine is between #6 and #4. You might have #3 or #2 which is the largest. PLANT IT might be the new name, the seller told me they just changed the bags. It's great stuff for my container mix.