Lowe Kantega 2, big expedition rucksack for particularly heavy and/or bulky loads
Macpac Ascent, smaller expedition sack for smaller jobs than the Kantega and/or where it'slikely to be particularly rough. Also, compressed a bit as a winter day bag when I've got The Kitchen Sink along, or to take full sets of climbing gear.
Macpac Pursuit, generally what Roos uses where I'll use the Ascent but I might steal it as a big daypac when out with the kids without her.
Lowe Contour Mountain 40, winter daypack, especially when skiing with steel edges
Lowe Contour Marathon 35, winter daysack for track skiing, general purpose daysack if I want slightly more volume or weight than...
Kimmlite (now OMM) Classic Marathon 32, general purpose daysack but also on those rare occasions I'm out for a run and need more than a bumbag. (We'll take one of the MM sacks each on a typicalday walk).
Lowe Mesa Runner bumbag, for light walk or ski loads
Lowe bumbag with water-bottle notch, for lighter and more active jobs than the Mesa
Eagle Creek Quirk, in-flight travel bag, big enough for a weekend away without having to check bags in and laptop-friendly.
Karrimor 15 litre daybag used when it's all that's needed for a small job. Something like around of snacks and spare jackets for a dander through the woods with the kids.
Roos might use any of those except the big Lowe (she'll shorten the backs on the Macs from where I like them), and in addition may use a Gregory Z55 as a backpacking sack (I won it in an OM competition but its purgatory on my back, but works very well for her: just goes to showthere's no guarantee of a perfect fit)