On my backpacking trip in Aug each time I will be camping next to an Alpine lake. Instead of hanging my bag I was wondering if I could submerge it. Was going to use a sea to summit drybag. Add some heavy rocks and sink it 3 or 4 feet in the lakes. I figure they wont be able to smell it if its underwater
Loc: Gateway to Columbia Gorge
My eldest son tried that once (fish in a ziplock plastic bag) and the local raccoons had a feast.
I can't hang stuff (being a horrible thrower and having arthritis to boot), so i use an Ursack. The S29 model is legal to use in jurisdictions that state that IGBC (Interregional Brizzly Bear Committee) approved containers must be used.
May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey
Anecdotally, I've read accounts of folks who successfully used the submersion trick. Just know that typical roll-top bags will seep water with enough depth and time so count on double-bagging the contents.
I've used Ursacks for years with no issues, but have never had a bear test them either. They're not cheap but super convenient compared to rigid canisters and tree-hanging.
I would hate to submerge my food, only to find out it accidently leaked! Actually submerging a food bag is not that easy- they tend to float. A quality dry-sack will weigh as much as the gear needed to hang food.
I have a good roped hanging system, a Ursack, and several different bear cans. It all depends on where I go. Most of the Sierra either explicitly require a bear can or word the hanging regulations so difficult that you can rarely comply with the law. I mean, counter-balance it 12 feet high? Me? How to I get it down, I am only 5'4" tall. And of course, once above timber, you cannot technically meet those requirements either.