How should I react to my 5 month old puppy who bites and growls at me when I correct him with a verbal 'nope'?

Not sure If I should call it defiance, but my 5 month old Malinois puppy has gotten defiant and bit and growled at me when I tried to correct him with a verbal "nope" command when I went to pick up a bag of trash. Typically the "nope" command works well. He started to drag a bag of trash that was sitting inside the fence that I was about to take out. I think he may have just gotten amped up into thinking it was a game of play because it seemed like he thought it was more of a fun game like tug judging by his general demeanor. He was really excited. His bites were hard and I want to figure out how to address it in the future so it doesn't become a problem since he's only 5 months old. He is a very well behaved puppy with the exception of this, which has happened a few times now. He does great with his obedience and typically has good play manners when I initiate play sessions. I could be overreacting, but I want to make sure I react in the right way so I don't enable this behavior.

No, just outside running around in the backyard. He isn’t usually out with me when I take care of the trash but I had one bag that wouldn’t fit in the bin. He started showing interest in playing with the bag so I attempted to correct him to leave it alone and then just take it out. Should I have just put him up immediately before trying to take it out and not even let the behavior happen? He’s never unattended unless he’s in his crate. I don’t allow him to be alone in yard. We are typically playing if we’re out in the yard or doing little mini obedience sessions.