Have you considered a rain cloak? The rain cloak (and shelter) by Onewind is amazing! I wear it as everyday rain gear instead of a rain jacket. The hood is spacious and adjustable. The cloak drapes over backpacks, shopping bags, and even children. I have yet to use it as a shelter or while biking, but here is a review from a cyclist:
It began to rain as I rode my bicycle down a local gravel road. I put on the rain cape, pulled the hood over my helmet, and threw the front of the cape over my handle bars. I stayed magically dry. Can’t wait to sleep in the shelter; what a system!
I like the rain cloak (and shelter) by Onewind. The cloak drapes over backpacks or bags, reducing wear on the waterproof surface. The hood is adjustable and spacious. Also, I like that a cloak will fit when my weight fluctuates.