Is this to cook in or to store your turkey in the fridge for later? I'm not sure the Ziplocks are for the oven. I wanted to do boil-in-bag cooking and the Ziplock website said temperture-wise they will melt.
You might have to get the Reynolds
oven roaster bags. (Or called something like that.) I would think they'd make them extra large for turkeys. I've used a few to put holiday gift baskets in and then tied the tops with a ribbon. They would be in the aisle next to the aluminum foil & plastic wrap.