'full of plastic' is a valid expression used in written English, and it is used to describe something that contains a lot of plastic.
For example, "I went to the beach, but it was full of plastic."
Your nets are probably full of plastic.
"An ordinary nursery seems messy, crowded, full of plastic.
"That way, you don't end up with a wallet full of plastic".
The lunch I cooked did generate a fully stuffed carrier bag full of plastic and polythene.
Superheating them and dumping them full of plastic may spell our doom.
Breathing down her throat right next to the wire cylinder full of plastic kickballs.
A waitress, toting a cart full of plastic-wrapped meats, trumpets the virtues of Shula's Certified Angus Beef with the fervor of a halftime cheerleader.
She's flown from Curacao to Europe with her stomach packed full of plastic-wrapped cocaine, transported briefcases full of drugs from Jamaica and only really stopped because she got caught doing it.
His Midtown Manhattan office (the location of which reporters are asked not to disclose) contains a room half-full of plastic boxes that spill over with ticket requests from all over the country.
The sea turtle was found on the South African beach at around the same time that a dead sperm whale washed up in a national park in Indonesia, its stomach chock-full of plastic waste. .
