Recently, this osprey pack has caught my attention as a nice looking 3 season choice -->http://www.ospreypacks.com/detail.ph...specifications
Currently, my go to bag is an Arc'Teryx Bora 55....I believe Grouseman77 has one too and likes it pretty well. Its not ultralight, but there is almost no need to carry a rain cover. Its also very well built and can withstand torture from heavy underbrush & thorns. The top lid is removable and makes into a good waist pack when backcountry fishing.