The Exos 58 is the sensible middle of the ultralight conversation
Most lightweight packs ask you to give something up. Usually it's the frame, and with it, the ability to carry a load comfortably on the day you leave town with five days of food. The Exos declines to make that trade, and that's the whole reason it's worth your attention.
Start with the suspension, because it's the feature doing the most work. The AirSpeed back panel is a suspended mesh trampoline that holds the pack body off your spine, and it's supported by a peripheral frame running around the outside of the pack. Advantage: the load transfers properly to your hips while air moves freely up your back. Benefit: on a warm climb you aren't carrying a sweat panel, and on a long day the weight sits where your body can actually handle it. For a 58L pack in this weight class, that combination is unusual.
Fit is adjustable at the torso, and I'd ask you to take that seriously rather than assume the out-of-the-box setting is close enough. Measure, adjust, load it, walk around. Ten minutes at home is worth more than any feature on this list.
The storage layout is exactly what a multi-day hiker reaches for. A large stretch front pocket that swallows a damp tent fly or a shed midlayer without opening the main compartment. Hip-belt pockets for snacks and a phone, so you're fuelling on the move instead of stopping. Compression straps to stabilise a load that gets smaller every day as you eat your food. Hydration compatibility for sipping without breaking stride. And a removable floating lid, so you can drop a few ounces on the trips where you don't need it.
The honest framing: this is a comfortable light-load carrier, not a heavy hauler. Overload it and you'll feel the lighter frame. But if you've trimmed your kit and you want a pack that's genuinely lighter without asking you to suffer for it ā this is the balanced, sane, well-tested answer. Have a look before your next long trip.