the Vega air filter, was known as the "bedpan of doom"

GM decided to put the paper filter inside an unopenable metal housing. The housing was still made in two pieces, and was pretty similar to a regular air cleaner design, but the top and bottom were permanently crimped together to enclose the air filter element inside. This assembly then bolted onto the carburetor directly.

https://www.theautopian.com/chevrolet-pissed-everyone-off-when-it-put-these-dumb-air-filters-on-the-vega