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Bear-resistant food storage containers, also called bear canisters or bear cans, are usually hard-sided containers used by backpackers to protect their food from theft by bears. Bear canisters are seeing increased popularity in areas where bears have become habituated to human presence, and are required in some regions such as Yosemite National Park in the United States. ==Construction== A bear canister typically weighs between 2-4 lb (1-2 kg), and has a storage capacity of 400 - 900 in3 (6 - 15 liters). The actual capacity in number of days of hiking food stored will vary with the appetite of the hiker, the selection of food, and the skill in which it is packed, but a 700 in3 canister will likely hold up to a week's worth of food for the average hiker. Hard-sided bear cans employ such materials as polycarbonate, ABS plastic, carbon fiber, and aluminum in their construction. An effective canister must resist both the tremendous strength and high intelligence of an attacking animal. Most containers are too large for a bear to simply pick up and carry away. The lid of a canister is usually recessed in order to prevent it being pried off, and tool use, or at least an advanced degree of motor skills, is required to remove it. Some bear canisters contain gaskets that block the scent from escaping the container. At least one model of soft-sided "bear bag" is made from Spectra (UHMWPE) fabric. While a soft-sided container may prevent a bear from eating its contents, the food inside is likely to be reduced to purée in the attempt. A newer model comes with an aluminum stiffener that protects the contents more effectively than the bag alone. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bear-resistant food storage container」の詳細全文を読む スポンサード リンク
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