Had this deal pop up on my newsfeed. Brand new and direct from Camelbak.
Normal Price: $300
Sale Price: $79
https://www.camelbak.com/en/military/gmi-packs/M01001--BFM?color=d3d9ceb5d9964eae9bd790590affbe17
Bought the CamelBak HAWG 3L MG Omega ABU Hydration Pack on a similar deal - 38.00 - well worth the price!
I had a BFM (the first gen, the design of which I like slightly better).
I swapped it for a Motherlode (also 1st gen) because, while I loved the size of the BFM, it was so large it encouraged me to carry too much stuff. I could fit enough stuff for some decent mountain hikes in inclement weather with self-rescue, first aid, signaling, SIGINT, recon, fire, warmth, more fire, extra clothes, SATCOM, ghostbusting and small child.
Probably the same reason I traded off my large ALICE ruck back in the day.
So yeah, sweet deal for a BFM, but be aware of the potential pitfalls.