Nate Diaz Snapchats Bag of Weed

Nate Diaz is done playing games when it comes to marijuana -- posting a big bag of weed on Snapchat Wednesday night ... with his own name written on the bag.

Our in-house weed specialists (surprise, we got those) tell us ... it appears to be about an ounce of high quality bud ... which usually runs the average pot-smoker about $225.