What's inside this bag?

At the checkout in our local Bunnings hardware store, bags after bags of 20kg potting mixes lined the exit.

Cola got rather tired after the shopping, and he decided to take a rest by throwing his body on to one of the bags. Hugging it, he asked, "Mami? What does this bag say? It's got a picture of a cow on it."

"Oh, let's see... That's a bag of cow poo poo!" I was amused.

Cola leaped up instantly, mildly disgusted.

"Uh oh, don't come near me... you've just slept on a pile of shit!"