Try a menstrual cup, period underwear or washable cloth pads, or a mix. Many people combine a cup on heavy days with period pants at night.
Disposable pads have a plastic backing and wrapper and many tampons come with plastic applicators; roughly 2 g of plastic per item and 240 items a year is about 500 g. The EU Single-Use Plastics Directive requires plastic-containing sanitary towels and tampons to carry a marking because they are so often flushed and found on beaches.
The catch: a cup or pants cost more upfront and need washing facilities; cups take a few cycles to get used to, and pants are usually part synthetic, so they are a durability swap rather than a plastic-free one.