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External-Frame Packs – consist of a rigid frame made of aluminum or aluminum alloy, from which the bag is suspended. Sleeping bags are strapped to the frame. It offers good ventilation against your back, heavy load-hauling capacity, and savings – half the cost of internal-frame cousins. However a high center of gravity makes it a poor choice for tough terrain. Advantages - Many hikers find external frames cooler in hot weather because the frame holds the pack away from your body and allows moisture to evaporate. This is definitely something to think about if you plan to hike a lot in hot or humid weather. External-frame packs put the weight over your hips and let the load sway slightly as you walk. Externals tend to weigh less than internal-frame models. Finally, external frames fit some people better than internal-frame models – and that’s what it comes down to. Another advantage is the convenience of being able to unzip the main compartment and get at any piece of gear at any time. Disadvantages - But if you try to climb or ski with such a rigging, you’ll be thrown off balance. Look up as you climb? Your head hits the back of the pack. If most of your backpacking is on developed trails and you carry gear for four or more days of travel, an External-frame backpack will best fit your needs. It places most of the load over your natural center of gravity, allowing you to walk normally and conserve energy while carrying even the heaviest loads. Internal-Frame Pack – employ a semi-rigid support system. All gear, including a sleeping bag, is stowed inside the pack. It carries weight low and close to your body, making it more stable than the external-frame pack for climbing or rock scrambling. Its low profile also provides better clearance. For off-trail they are less likely to catch on brush and branches. All gear is stowed snugly inside the pack. You can turn around and maneuver without loosing balance. Many find its weight distribution more comfortable. One disadvantage is that they are sweatier against your back. Another is that hiking long distances with heavy loads in an internal-frame pack will be hard on your back. If most of your pack use is on difficult terrain, or for activities that require unrestricted arm movement, an Internal-frame is a good choice. These packs ride close to your back for better balance on difficult terrain. And with no exposed frame parts, they're easier to store in canoes, airplanes or buses. OK, now where can you look to check out backpacks? Start with any local outfitters in your area. Also check out the Internet. Below is a list of manufacturers and outfitters.
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