I sell all of the packs mentioned so far, Badlands, Eberlestock, and Blacks Creek. Best of the bunch as far as I'm concerned is the Blue Widow. Versitile enough to be used as a daypack or expand enough for bivy hunts and packing meat.
If I wanted the very best day pack, the very best pack for packing gear, and the very best pack for packing meat, I would own three different packs. But the Eberlestock Blue Widow does a darn good job at all three tasks. That's why they call the J series packs the "Just One" pack system.