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A page like this one, as well as a number of questions on this site, discuss how to pack food safely from bears. What about other animals?
This post advices a pretty sophisticated way to protect food against rodents. Is that really needed? This counterbalancing method appears pretty complicated, but a bear canister for the occasional rodent appears overkill. Are there other ways in areas where meeting a bear is unlikely? The easiest way would be to just risk it and keep food deeply packed away in my backpack. Would that be very unwise?

It seems quite difficult to me to keep food at least 15 feet above the ground and 10 feet horizontally from a tree trunk. That's almost 5 metre!

Are the warning exaggerated?

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In short, this is how "unlikely" areas become "problem" areas. –  Russell Steen Apr 22 '13 at 11:41

3 Answers 3

The best recommendation is to take all necessary precautions for yourself, wildlife and the fauna.

What measures make sense depends on the area you are visiting. For example, in more remote parts of the east coast (Maine, New-Brunswick, etc.) you will only find black bears and they tend to be pretty shy. In these areas, many people rely on hanging their food, as the bears usually prefer to avoid people, and good trees are plentiful.

In more heavily-trafficked areas such as National Parks, bear encounters are more likely, and the bears tend to be less fearful of humans and savvier about how to get at your food. Some southern portions of the Appalachian Trail now require bear cans, either year round or at least during peak hiking season. The same is true in popular areas of the Adirondacks. In the western portion of North America, where you are more likely to encounter grizzlies, carrying a bear can is a very good idea. Grizzlies are larger and more aggressive than black bears, and in parks like Yosemite and Yellowstone the bears have food bags pretty well figured out. They recognize bear cans as well and will often knock them around in an effort to get at the good stuff inside. Note that in many Parks you will be fined if a Ranger catches you backpacking without an approved canister, and in these situations a bear can basically pays for itself!

However you decide to store your food, you may want to consider odor proof bags such as OPSAK or NyloBarrier. By keeping all your food in a sealed odor-proof container (along with any food scraps, wrappers, dirty dishes, and scented articles such as soap or chapstick), you will reduce the likelihood of attracting animals to you camp in the first place. Added bonus: keeps your snacks from getting soggy when it rains all night!

An important consideration with rodents is that if they get to your food, you should be wary of contracting diseases such as Hantavirus which can be fatal.

You may also want to consider a food bag made of Cuben Fiber:

On several occasions I've seen mice check out my Blast food bag and eventually give up. I let one persistent mouse chew on it for the entire night- by morning he had done some minor damage but did not get into my food.

as per Joe Valesko. My experience was similar but your millage may vary.

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Nice post, +1, but: "This depends on how much risk you are willing to take and how high the risk is." It's not just hikers who suffer when bears get their food. Problem animals often end up having to be shot. This makes it not just a convenience/risk issue but an environmental/ethical one. –  Ben Crowell Apr 21 '13 at 22:58
    
Good point! It was mainly intended as a 'do not try this at home' disclaimer. ;-) –  ppl Apr 21 '13 at 23:30
    
I improved (hopefully) the first paragraph of the answer to reflect your input. Please feel free to edit the answer directly to improve it further. Thanks! –  ppl Apr 25 '13 at 16:17

You propose packing food deeply in your backpack. I'd specifically recommend against that. Bears (and other wild animals) have vastly more acute senses of smell than humans, and they won't hesitate to chew through your pack to get at anything buried there. Even if there aren't bears in an area, there are likely to be some kind of varmints (squirrels, chipmunks, opossums, raccoons, porcupines, marmots, mice, rats, etc) that are more than capable of chewing a hole in the side if your pack. Once a friend of mine found that a chipmunk had chewed a 2" hole in the side of his backpack in broad daylight to get a sandwich he'd left inside.

I'd recommend taking some level of precaution to protect your food, your gear, and yourselves. If the rangers in the area offer some recommendation, I'd probably take it. :)

Bear bags aren't as safe as bear canisters, either (I've known if raccoons that were able to eat food directly out of a hung bear bag), but they're still better than just leaving food in a pack or tent.

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"Unlikely" is not the same as "won't happen." You're going to the White Mountains in California, so call the ranger station in Bishop and ask them. They will probably tell you that bears do exist there, so the probability is not zero.

"It seems quite difficult to me to keep food at least 15 feet above the ground and 10 feet horizontally from a tree trunk. That's almost 5 metre!"

This is absolutely not exaggerated. I've had a mother bear keep me awake all night while she and her cubs worked on getting my food down from a tree. This is exactly the reason why bear canisters were invented, and are legally required in many areas. They're basically 100% effective, whereas bear-bagging often fails.

If you really don't like the extra weight of a hard-plastic canister such as a Garcia, you could buy something lighter like an Ursack. However, the Ursack is not legal in all areas. Ask the rangers before you go. The Ursack is actually supposed to be less effective against rodents than bears. It's made out of woven kevlar fibers, and the weave is rough, so small rodents' small teeth may be able to get in the gaps in the weave.

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I'm more worried about the bulky volume than amout the weight, they seem very big... –  gerrit Apr 21 '13 at 19:52
    
They come in a variety of sizes. The Garcia is 615 cubic inches, but the Bare Boxer canisters come in sizes as small as 275 in3. Brands to google include Bare Boxer, Bearvault, Garcia, and Bearikade. But typically all you can get as a rental is the standard-size Garcia. How many days are you going for, and how many people? E.g., if it's only a couple of days and there are two of you, maybe you could share one Garcia. –  Ben Crowell Apr 21 '13 at 20:23

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