Other than bulk, they weigh next to nothing. Grab some and find some room. You'll have something to try to mitigate anyway. Good luck.I just put a meeting on my calendar on a day after the trip and copied the URL to this thread. As long as nothing pops up that keeps the trip from happening, I'll let you know!
There's just enough people saying they thought the canned oxygen helped that I'll probably take some and try it. Nothing to loose but a couple of bucks. I'll include my thoughts on it also.