Sporty High-Waisted Period Underwear | Period Co.

My favorite leakproof underwear at the moment, and they're affordable. Wear them to catch menstrual flow and/or bladder leaks. Available in many colors and sizes XS-4X. Absorbency varies by style, but this one holds up to 9 tampons-worth of fluid (however much that is).

Huge bonus: The site uses inclusive language, avoiding the incorrect and exclusionary shorthand of "women" when "people who menstruate" is the intended subject.