THE ONLY WAY TO KNOW FOR SURE FOR YOURSELF IS EXPERIENCE. NOT BY JUST LOOKING AT THE BAG BUT ACTUALLY WEIGHING IT WITH Y9OUR HAND. AFTER A WHILE YOU BE ABLE TO TELL JUST BY HOLDING IT. I DONT ABOUT EVERYONE ELSE BUT THAT WHAT I USUALLY DO AND IM NEVER REALLY OFF. WET WEED CAN "LOOK" THE SAME SIZE AS ANOTHER BAG OF DRY STUFF BIUT COULD TURN OUT BEING DOUBLE THE WEIGHT