SMD Starlite? It's my winter pack of choice.
Technically, it has the same 4200 cubic inch volume of the Circuit, but the main pack body + extension holds 3400ci vs 2900ci for the Circuit. SMD only figures 800ci for the kangaroo pocket and 3 side pockets vs 1100ci for the pockets on the Circuit. I have a hard time believing(having tested out an Ohm) that the volume of the pockets on the Starlite(which I own) is 300ci less. I can fit two 2L platy bladders in the long side pocket alone, with some room left over. The kangaroo pocket easily holds rain gear + a Duomid, and the two smaller side pockets each fit a canister stove, 8oz canister, and Trappers mug. With the stays, it's a 30oz pack. Minus the stays, using a CCF pad in the pad pocket as a frame, it's a 1.5lb pack. I find that a folded over torso-length ridgerest in the pack pocket is good for me to 25lb, and perhaps even 27.