9:26 AM PT -- Law enforcement sources tell TMZ they observed a 2018 Mercedes driving the wrong way just after midnight Thursday. Cops pulled the vehicle over, and smelled marijuana coming from inside ... they searched the Mercedes and discovered 24 circular tins of marijuana.

A$AP was arrested and taken back to the police station where he was strip-searched ... and cops found 3 more tins inside his underwear. A$AP told cops the weed was for personal use.

A$AP Mob cofounder A$AP Bari got busted for drugs in Pennsylvania and is facing 2 felony charges ... TMZ has learned.

The fashion designer was arrested Thursday in Palmer Township, PA and hit with 2 counts of manufacturing, delivery or possession with intent to distribute drugs ... according to law enforcement sources. It's unclear what drugs he was allegedly slinging.

A$AP's also been charged with misdemeanor counts of possession of drug paraphernalia and possession of a controlled substance.

He was booked at the Northampton County Prison and bail was set at $25k. He was released after bonding out.

Bari was also arrested earlier this year -- in London -- for allegedly sexually assaulting a woman at a London hotel in July 2017. She sued him last November, as well, but he fired back with a suit of his own in August.