It depends whether it is powder heroin from the East Coast, aka "China White", or (more likely, being in Texas) Mexican black tar. If it is powder, one "bag" would weigh 0.1g, with tar, a bag could be 0.5g or 1g, depending on the dealer. So 36 bags could be 3.6g of powder, or 18g-36g of tar.

It depends whether it is powder heroin from the East Coast, aka "China White", or (more likely, being in Texas) Mexican black tar. If it is powder, one "bag" would weigh 0.1g, with tar, a bag could be 0.5g or 1g, depending on the dealer. So 36 bags could be 3.6g of powder, or 18g-36g of tar.