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Canister requirements are specified for each Park or Forest. SEKI, Yosemite, and Inyo are all different. The regs are spelled out each year and they often change. The map reference above will not stand up in court, or more importantly in front of a backcountry ranger. (A copy of the regs Will show them the light.)
For the Parks search for Supeintendent's Compendium -

Which states somewhere around page 10 -

So unless there is snow covering the lockers, you must use them between Forester and Pinchot, unless you hike through that 34 miles in a day.
For Inyo, you need to clear the east side between the pass and Whitney Portal in a day to avoid that requirement area, and camping on the west side is thin and dry between the pass and the tarns above Guitar Lake.
In Yosemite canisters are required if you are "camping". If you can hike between Donohue and TM in a day, and between TM and the Valley in a day, you don't need one assuming you overnight in a secured/lockered facility.
Relying on lockers greatly impacts your hike. A canister provides flexibility.
Edited by greg23 on 08/31/2012 10:28:17 MDT.
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