see if you can find a Timbuk2 hatchback bag. I have one and it is awesome but they are discontinued. Keeps frozen stuff from the store cold for a couple hours. Also Green Guru makes a small handlebar cooler bag and a cooler pannier. https://www.greengurugear.com/produc...-handlebar-bag You can find those cheaper if you google. I have the black 6L bag and it works well, too. Green guru's cooler trunk bag is on sale and would probably fit your rack.