Ergodyne Arsenal 5187 Respirator Mask Storage Bag, Fits Half Face Respirators, Clamshell Design, Loop Attachment Gray

Maybe this will give you some ideas? I use the Ergodye respirator bags to carry my family's respirators in the car. This one is for just one mask, but sounds like that's a good fit for you:https://a.co/d/0caD8Qf7