The last year's forest order disappeared from the Inyo website stated, and I paraphrase, any container manufactured to keep food from bears is legal. Again, I don't know if it has been renewed for this year.
I would buy the latest and greatest from Ursack. The two bags I own are 14 and 7 years old respectively and were two versions of the TKO product.
I use them how the manufacturer, not the forest service, states they should be used. Below the tree line, tied to a tree, and above the tree line hang from a rock, so non-climbling marmots and chippies can't get to them. I've used them at Trail Camp and above Guitar Lake successfully, both locations within the Whitney Zone.
In those 14 years, I have never had an Ursack attacked.
