All my trips are unique and the following is just one- 10-day trip, late season, high altitude, expecting freezing nights, solo, bear cannister required. It is the Keweah (high Sierra) trip that I posted on the "trips" section. Total weight is 40.5 pounds - about 40 pounds on my back.

Food (1.4 lb/day) and gas (consumables) -- 38%
Extra clothes not worn-- 15%
Shelter and sleeping --13%
Items worn (clothing, shoes) or carried in my hand (trek poles) -- 11%
Pack -- 7%
Bear cannister -- 6%
Other (first aid, personal hygiene, book, camera, maps) -- 5%
Water -- 3%
Cook gear -- 2%

Yup- bear cannister is a considerably heavy item! Good thing about food and gas is that this gets less every day.