The Los Angeles pro sports teams' joint effort to support the wildfire victims with "LA Strong" shirts is a massive success -- TMZ Sports has learned more than 30,000 items have sold so far -- with all proceeds going to help the cause.
The 17 local organizations teamed up with Fanatics to make merch with the "L.A. Strong" phrase on Friday ... as a tribute to those impacted by the devastating wildfires.
We're told the orders for the merch -- priced at $35 each -- are among the most popular on the site .