When I was hiking in the Wind River Range in Wyoming back in August 2016, my brother Tim and I both carried BV450 bear canisters. The other two jokers in our party, Cory and Chad, simply bagged it. That was the one instance where Chad took something lighter than what I did. The canisters were comparably heavy (the smaller BV450 Solo is still over 2 lbs) and always took up a large volume in our packs, even as they emptied out. That bothered me and I thought there must be a better way.
Well, it turns out there just may be: enter the Ursack S29.3 AllWhite Kevlar bear bag. It weighs only 7.8 oz and collapses as it empties out. Holy Grail, right? If you're hiking the PCT, maybe not. It's not on Yosemite's list of approved bear-resistant containers. I don't know why it's not on the list, but the result is that carrying the Ursack might be hit-and-miss in terms of approval along the PCT.
I guess I'm stuck with using the BearVault, and graduating up to the BV500. Ugh.