Portland Design Works Owl Cage Certainly not your standard water bottle cage design here. It's the Portland Design Works Owl Cage, and it certainly looks like an owl, and is a cage. Perfect for holding your water bottle, with its wings, and likely keeping watch over it in all directions, too. Birds should not be bothering your bottle now. Portland Design Works Owl Cage Specifications: Includes 2 stainless steel mounting bolts Material: 5052 alloy Weight: 67 grams | Portland Design Works | Owl Cage Black/silver | Aluminum