I got to take the Core out for a spin in the Pintlers, this was my first official SUL trip- I’ve flirted w/ sub 5#’s before, this time I was under :)
the volume is very nice; with this kit I had plenty of room for 5 days of food- wether that pushes the weight for the pack I can’t say
w/ food & water the pack was probably right at 10#’s; the pack carried very nicely- the wide, padded straps felt really good- the hip belt just kept the pack from swinging
the water bottle holders worked really well, easy to remove/replace and the weight in the front might just be advantageous
the small pockets worked well too- one side I had snacks/electrolytes- the other map/compass, sunscreen and anti-chafe; easy to access and roomier than their small size belies
I used a GG sit pad against my back; I believe this helped in the comfort department and I use the sit pad frequently at stops and camp, at night the pack w/ pad goes under my feet as I was using a short pad
got rained on in the evening and while everything that needed to be was in a dry bag, all contents were bone dry at camp
I don’t think I’d want to push the pack much past 15#, not that it wouldn’t hold together, I think it would- it would be pushing the limits of what is comfortable me thinks

