Double Stroller Carrier Bag

My other half and I have two lil guys arriving at some point over the next 6 weeks (!!). We’re pretty much sorted with equipment and some of the things we’ll need. This morning, I started thinking about how we’d transport their stroller if we ever had to take a trip somewhere. Does anyone know of a double stroller carrier bag that would work for the Bugaboo Donkey? The one I saw recommended for double strollers seems a bit too big. Any advice? Thanks in advance!