There is seriously like 1 to 2 inches. Only thing I can think of putting in there is one of those wearable TV sunglasses things. The guts I mean. I wouldn't want to put that on both eyes, unless you have a camera feeding images through to the screens. When you get a bucket, and try wearing it for a few hours you'll understand why everyone is asking "why?" lol. I honestly thought of doing the same thing way back when, before I had anything, but when you play with a Helmet up close, you'll understand the ... limitations, lol.