Used Ursacks bike touring in Alaska, Canada & lower 48. Needed two for the longer hauls between supply points & teamed with odour proof liners. Easy to use & great to be able to reduce the bulk as we ate through our supplies. Great product.
Was not sure how to add another alternative but the Sabered Insider Bear Safe is another alternative that should be considered. Its a tall skinny rigid canister that fits inside your pack next to your back. You pack around it. I do not live in a Grizzly Bear area but in an area loaded with black bear. Have used an Ursack with a smell proof liner for years without issue and can recommend it highly. Its light, convenient and will hold enough food for two for a 10 day outing. Recently I have purchased the Insider Bear Safe ($79) because a rigid bear cannister is now required for hiking in the Smokies and in some areas of SC and GA through the month of June. I am not exactly an ultra-light backpacker but am able to make do with a 58 liter backpack (with floating top) and hit the trail for 3-4 days at a time with 3 L water and a trail weight of 32-34 lbs despite the added weight of the rigid bear cannister. It fits in the outside kangaroo pouch on my pack as well and could be cinched in tightly to anchor it more closely to my back if needed for winter backpacks when heavier sleeping bags and heavier clothing put interior pack space at a premium. Glad to hear that Ursacks are now IGBC certified. May end up using it with the bear cannister anyhow simply because cookwear and toiletries need to be stored away from tents too and cannisters are not well suited to accomodate those items.
I have the BV500, only because it, and a few other hard case canisters are required where I like to backback. I dislike it because of its size, its shape, its weight and its price. I'd take the Ursack, any day., but it doesn't meet the requirements established by the "IGBC" (Interagency Grizzly Bear Committee) , even though the Ursack has had only 2 documented issues in bear country vs the 85 issues with the BV500. I smell a conspiracy.