Backpacking trip contents (click to enlarge)

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Backpack: Aether 85 (Aether 70 pictured, but use the 85 as it is lighter, oddly)

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Tent: Big Agnes Seedhouse SL2

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Sleeping bag: Big Agnes Mystic 15

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Contents and weights (actual, not mfg list weight; yes, I weighed everything!)

Backpacks
Osprey Aether 70 (large: 5 lbs 1 oz) or Aether 85 (large: 4 lbs 12 oz)—yes, my 85 weighs less. Other samples will vary slightly and this may not be the norm. The Aether series was updated in 2009, so don't expect this to hold true.

Tent stuff (8 lbs 4 oz)
Tent: Big Agnes Seedhouse SL2 (3 lbs 11.5 oz—includes poles, 8 of 12 stakes, rain fly, footprint)
Sleeping bag: Big Agnes Mystic long (2 lbs 10 oz)—15 degrees; semi-rectangular; super roomy, even for me, allowing plenty of room to roll around inside with ease and sleep on my side
Sleeping pad: Big Agnes Insulated Air Core rectangular (1 lb 12 oz; 2.5")
Pillow: FlexAir dual chamber (1 oz)
Big Agnes Pumphouse (1.8 oz)—used to pump dry air into air mattress

Clothes (potentially in backpack: 3 lbs 12 oz)
Rain/wind jacket: Mountain Hardwear Cohesion (1 lb 1 oz)
Fleece: The North Face Khumbu (1 lb 9 oz)
Long-sleeve shirt: REI midweight MTS (11.75 oz)
Gloves: REI Thermo fleece (3 oz)
1 pair extra ExOfficio underwear for 3+ day trips (2.75 oz)
Mountain Hardwear Phantom down jacket (1 lb 6 oz, optional depending on elevation and/or season)

Cookware (14 oz)
Stove: Coleman F1 Ultralight (3 oz)
Snow Peak Fuel (5.5 oz when full)
Matches (.25 oz)
Evernew .9 Liter titanium pot (4.75 oz)
REI Chefware spork (.5 oz)

Food (avg 1 lbs 5 oz per day)
Breakfast: PowerBar ProteinPlus (2.75 oz)
Lunch: Peanut butter & honey sandwich (4.5 oz) & PowerBar Protein Plus
Snack/on-trail use: PowerBar ProteinPlus
Supper: Mountain House 2-serving (5.7 oz avg), PowerBar Recovery Bar (2 oz)
*Add 1-2 PowerBar ProteinPlus depending on daily elevation gain
*Add 1 lbs 5 oz food for each additional day

Water (full weight: 7 lbs 6 oz)
Camelback Omega 100 fluid ounce (8 oz empty; if full, 6 lbs 7 oz)
Katadyn Hiker Pro filter (14 oz)
Gatorade 32 oz bottle for around camp and filling pot (1.75 oz)

Camera equipment (11 lbs 2 oz)
Camera: Canon 5D Mark II (2 lbs) with 2 extra batteries (2.75 oz each)
Wide lens: Nikon 14-24 (2lbs 4 oz)
Wide-tele lens: Canon 24-105 (1 lb 8oz)
Tripod: Velbon 530 (2 lbs 13 oz)
Tripod head: Acratech Ultimate (15 oz)
Point-and-shoot: Panasonic Lumix FX48, 1 spare battery (6.25 oz, not in pack)
2 graduated neutral density filters and holder (4.5 oz, optional—haven't brought on last few trips)
Polarizer 2.5 oz
Bubble level & cable release (2.5 oz)

Trekking poles (not in pack)
REI Peak UL (14 oz)—would highly prefer Black Diamond's flip locks, but the 4 oz less weight of the REI's is rather noticeable, and thus my preference

Miscellaneous (2 lbs 2 oz)
Alarm clock (4 oz)—because I need something loud to wake me up
8 aspirin tablets, 1 Princeton Tec Pulsar LED (.5 oz)
2 Band-Aids, 1 gauze pad (.14 oz)
Bodyglide anti-chafing and anti-blister stick (1 oz—occasionally bring)
Duct tape (.12 oz)
GoReady repellent w/ 20% picaridin (.75 oz)—smells good, easy on plastics, effective for mosquitos
GPS: Garmin eTrex Vista CX (5 oz)
Gregory rain cover (5.75 oz)
Headlamp: Petzl Tikka Plus (2.75 oz)
Knee pad (2 oz)—for low-to-ground pictures, tent entrance/exit floor mat, & pad for sitting on
Moleskin (.12 oz)—for covering blisters
Remington 4.5" fixed-blade knife for my ever-feared mountain lion run-ins! (6.75 oz)—not in pack
Extra shoelace (.5 oz)
Sunscreen (1.5 oz)
Toilet paper (.75 oz)
Topo map (2.75 oz)—not in pack
Trowel (2 oz)
Ursack bear and rodent-resistant food bag (10 oz)
Wet Ones (1 oz)
Whistle (.5 oz)

Total: 39 lbs 9 oz (avg 38 lbs with full water for starting out on a one-night trip)

Nights backpacking in tent since 7/12/2008: 40 (19 trips)