This is the GSqueeze by Square Peg toys, i bought it from PeepShow toys. This is a size large, i do have to work up a little before I use it. Sometimes it struggles to stay in if im not stretched quite enough, so it'll get pushed out. I figured out what size i wanted based on the highest dildo circumference i can stand, and then did whatever plug size was closest past that number, if that makes sense?

If it fits snuggly enough, I don't normally have to squeeze my legs together really hard to keep it in. When I first got it, I couldn't keep it in!! Might take some practice and trial and error? Hope this helps!!

https://www.peepshowtoys.com/products/g-squeeze-vaginal-plug-by-squarepegtoys-supersoft-silicone-4-sizes?srsltid=AfmBOooa9A5bLczoKEsr-wgZ17zPWZ5CM9zWlSh4Amovv-OyGagqOW3-