The only trunk bag I have any experience with would be one from nashbar that has been discontinued. The closest bag they now have is
this one, though mine didn't have the side pockets, was in hi-vis yellow/green and was insulated. Great bag, wish I still had it. Heck, if they still offered it I'd buy it again. It got stolen along with my last bike and I've since been using a fridge pak soft cooler bag thrown in my handlebar basket.