Do you own or have you considered some sports goggles? I only wear glasses to read (like now, typing at the screen), but have known folks who wear a type of goggles while doing sports. Specifically ground fighting.... so they REALLY stay in place. They look similar to swim goggles, but without quite the same seal to the skin. They're also impact resistant.
Hmm. Googling seems to indicate they are indeed called prescription sports goggles. Might be worth looking into for trooping? Most are extremely low profile, so they should fit in the bucket well.
And lastly, I gotta get in on the bucket interior pic parade.
Mine is a VERY tight fit, but that's all the junk in my bucket.
- Modified pads for my ears which contain hacked apart studio headphones for
- The rear mounted hearing assist (usually has a piece of black fabric over top
- amp and iCOMM mounted up high
- fans at the very front by the hovi speakers with battery mounted at the chin