Joe, Bear canisters are indeed heavy. You can search the web for the term to see the various ones available. I think the Portal Store and the Visitor Center have the black "Garcia" brands, but I could be wrong.
If you want to go the lightest possible, look up the Ursack S29 AllWhite. That's what I have, with the aluminum liner. Lighter than the others. You don't need the aluminum liner for the Whitney trail, since it isn't bears that you are keeping from your food, but mice and marmots.
Yosemite N.P. hasn't updated their approved canister list since Ursack came out with the S29, but I wouldn't hesitate using it there. You need to learn how to tie it properly. I also attach a bear bell to mine so I would wake up if something were messing with it.
