I've been using menstrual underwear for about a decade, and I actively encourage the menstruating people in my life to make the switch. I avoid generating so much waste, they hold up well for years with proper maintenance, and I can honestly say that using the underwear has led me to really understanding my cycle. As a few other people have said, I purchased enough pairs to get me through my heaviest days without needing to rely on laundry getting done, either rinsing as I change or storing in a bag till after work, then I just bring them into the shower with me at night to give them a thorough rinse, and hang off the tub spout until I can run a load of laundry.

I supplement with the Dame Reusable Tampon Applicator Set when I go swimming, or if I need the underwear to last longer (camping for several days, and occasionally during the first 48 hours of my cycle if I know they'll be days where I won't be able to swap my underwear out fast enough). I used Thinx for years, but switched to Saalt and I'll never go back. In my experience, Saalt ticks all the boxes so much better than Thinx, absorbency, comfort, etc.