Waterproof Cover for Bullet Bazooka

Last weekend when I checked my Bullet Bazooka, I found out that the water proof covers were torn already. One of the reason is that the cloth cannot withstand under hot sun and rain condition.

But if you looked at it carefully, I think the main reason is caused by bird cling on the cloth. The birds like the sounds from the Bullet Bazooka.

I need to think another method to make the bullet Bazooka water proof.