Ursack makes a metal sheet that becomes the cylinder inside the bag to prevent crushing. It should fit in the boat easily that way. Just make sure to use a rope to hang or secure the bag. Bears can't pick up a canister and carry it off. They can carry an Ursack away.
My friends use them and prefer them for backpacking for similar reasons you are looking into them. They should be fine for prevention unless you are dropping lines in any of the backcountry wilderness areas that require certified containers; they have an ongoing issue with the IGBC.
Thanks for the reply.
My wife and I have backpacked in Yellowstone and the Tetons and have used the plastic vaults to store food etc for a week. But I don't want to strap them on the deck of our kayaks. Therefore we're looking at alternatives. Now that we're in our 60's looking forward to the kayaks taking a load off our backs.
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