Great new hiking day pack: 18 litres, three compartments, water bottle pocket, 90 grams assorted colours, available: http://www.backpackinglight.com.au/ I think you could squeeze an overnight trip into it. Worth a try anyway. Add it to the suggestions here: http://www.theultralighthiker.com/hunting-daypack/
The Ultralight Hiker
Ultralight hiking, backpacking, bushwalking, deer hunting, canoeing, pack rafting, tips, trails, adventures, gear, reviews...Over 1600 posts & 70 years' experience.