I just did that. It’s 10g lighter now.
Why not just tie some balloons to your helmet. You can use way more helium that way therefore having much more benefit.
wow you must have put allot of thoght into that one!
why put it in your uni, it’s like 10 times cooler to talk with it 
Helmet 
We kicked this idea around last year.
Why not store anti-matter inside the seatpost?
boom.
First of all, anti-matter combined with matter creates huge explosions, didn’t you read Angels and Demons?
Secondly, I love this place. When i have a bad day I just read the latest inane post and i become happy.