Will cooler fit?

Anyone know how well this bag will fit in rear of T15 I got? Guy I dove with a while back had it in his T13 and thought would be a great idea. Put some ice in before I launch and bleed fish as soon as caught and on ice. Just wondering on fitment.
Also anyone have experience with this cooler?

Thanks

http://www.austinkayak.com/products/1239/Native-Fish-Bag-Cooler-Large.html

If you're really interested I can get the dimensions for you.

But here are the basic dimensions from their website (http://nativewatercraft.com/acc_overview.cfm):
Native Fish Bag - 36" long x 19" at the widest point x 8" deep
Native Medium Fish Cooler - 31" long x 17" at the widest point x 8" deep
Native Behind Seat Cooler - 21" long x 9.5" wide x 9.5" deep

Yeah I need to measure yak but keep forgetting lol. was just curious if someone had one already in yak.