I saw your PM but figured I would put the info here for the good of viewing public. Hope you don't mind...
One word: "wow". The Exos is night and day different than my Arcteryx Atmos 50. It's even night and day compared to the three other packs that I tried all my gear in at REI. For reference I tested the Flash 60 not 45, Boreos Lost Mountain 60, and the Boreos Buttermilk. Obviously I'm testing the next size up if you will, in volume, compared to you. More on that in a second though.
But yes, the Exos is fantastic. I just loaded it up with everything I typically take, including 3L of water and food for a few days, and the suspension feels fantastic...in that I barely feel the load. The Exos's suspension would have to turn on me, court my girlfriend, and key my car, before I thought negatively of the trampoline. Total convert. Contrary to what you've read I would also argue that the weight transfer to my hips is the best so far for a couple very individual reasons: the torso length is spot on, and the fabric/foam used for the waist belt and straps is very nicely stretchy. To the former regarding fit, I measure 20" but much prefer my pack riding low on my hips to address some back problems. Regarding the latter, the hip belt in particular is extremely comfortable because of it's flexibility and the forward pulling straps that pull the top and bottom of the hip belt as you tighten. However, of note, the 58 has additional padding than the 46. Having tried on both, I'd definitely err on the size of the 58 for the additional padding and simply compress down the pack's volume.
And when it comes to volume, boy does the 58 work well for me! All of my things fit comfortable with plenty of room to include more food, or perhaps a slightly larger cook kit without fearing that I'll burst a seam. The aforementioned bear canister would fit fine in this pack, that's for sure. I just picked up a Fly Creek UL2 for solo trips but even with my larger tent (see below) for my girlfriend, dog, and I, everything fits quite comfortably. And I'm quite pleased that carrying smaller loads the over/under compression system works fantastically to bring the volume down. I'm really glad I didn't go with the 46 now because of the flexibility. This pack will cover 4 seasons if a person is even remotely paying attention to what they're doing.
Here's a quick gear list of what's going into it (the major stuff):
Exped Dreamwalker Syn 133 40* bag in Sea to Summit eVent compression bag (15L, about 8" around by 12" long)
** soon to be replaced by EE 20* Quilt which will pack a ton smaller and be a pound lighter
REI Quarter Dome T2+ tent w/footprint
** split into a pole bag, and a dry bags for body and fly (3L and 5L respectively)
Exped SynMat UL LW
Stoic 700ml Ti Pot with Caldera Cone Fusion inside
Exped inflatable pillow
Exped Schnozzel pumpbag with all my clothes (occupies maybe 7L of moldable space with air sucked out)
Outsak UL (the larger one) with 3 days of backpacking meals
Eddie Bauer Downlight jacket in stuff sack
Camelback 3L bladder (one without baffles so it's kind of a log)
In the two vertical pockets on the outside I have:
1/2 gallon ziploc with toiletries
couple compressed rolls of TP
REI Taku WPB jacket (all 26oz of it, oof)
* soon to be replaced with 13oz alternative on order
Top lid is quite a bit roomier than I thought and easily fits all this plus room for a lot more:
Rab Cirrus wind shirt stuffsacked
Tikka 2 headlamp
And the hip pouches have more room than I have stuff!