Here's one more option that we use. Locate a plumbing (faucet) O-Ring that will fit snugly on the stopper. Slide it on the stopper from the bottom up to near the top, leaving it so it keeps the drain plug open as high as you want it.
This lets the water drain but stops your rings, etc. from passing thru.
Not my idea as it came from this forum a few years ago. It works!
2018 Eagle HT 26.5 RLDS. 2009 F150 Supercab UNICORN, 5.4L ,3.73, HD and Max Tow Packages, Timbrens, Bilstein shocks. Andersen 20K hitch. TST 507RV TPMS. Hydro Life HL-200. 16" Goodyear Endurance. Progressive EMS-LCHW50.
Best friend wife, Di, and dog Cooper. RETIRED 6/30/16. WOOHOO!