Polaris Matryx Indy, Switchback & Voyg. Polaris Matryx Underseat-Liner Bag, 2884752. One (1) Matryx Underseat-Liner Bag. All Polaris Matryx Indy, Switchback & Voyageur. Easily removal and water proof storage bag allows you to keep spair gloves and hats dry on rides.