A sealed 2lb container of chocolate Nitro-Tech was sent (btw they don't make a 5lb tub). The lab would measure out 100g of powder, so regardless of how much I sent them (as long as it was over 100g) they would use an exact amount. I'm not saying that Nitro-Tech is a good economical buy for the consumer. I'm just saying that it tested ok. Of course those 10 extra grams of "protein" could be creatine, just a thought.