The internal frame backpack is a recent innovation, invented in 1967 by Greg Lowe, who went on to found Lowe Alpine and Lowepro, companies specializing in backpacks and other forms of carrying bags for various equipment.[8] An internal-frame pack has a large fabric section around an internal frame composed of strips of either aluminum, titanium or plastic, sometimes with additional metal stays to reinforce the frame. A complex series of straps works with the frame to distribute the weight and hold it in place. The internal frame permits the pack to fit closely to the wearer's back and minimizes shifting of the load, which is desirable when participating in activities that involve upper-body movement such as scrambling over rocky surfaces and skiing. However, the tight fit reduces ventilation, so these type of packs tend to be more sweaty than external frame packs. The internal construction also allows for a large storage compartment; a few lash points (including webbing loops and straps for sleeping bags and other large items) may be present, but as the frame is completely integrated, it is difficult to securely lash larger and heavier items which do not fit inside the compartment to the outside of the pack. Internal frame packs originally suffered from smaller load capacity and less comfortable fit during steady walking, but newer models have improved greatly in these respects. In addition, because of their snug fit, the improved internal frame models have largely replaced external frame backpacks for many activities. https://i.pinimg.com/236x/f5/db/24/f5db248ad132bc4f78260d9a37ba0b72---day-fitness-fitness-abs.jpg?b

Alternative names include haversack from the German Hafersack meaning "oat sack"[1] (which more properly describes a small cloth bag on a strap worn over one shoulder and originally referred to the bag of oats carried as horse fodder), Kraxe (a German rucksack with a rigid framework), and bergen (a large load-carrying rucksack, from a design issued by the British Army during the Second World War).[2] In fact, Britons used to call Alpine-style backpacks "Bergen rucksacks", maybe from the name of their creator, Norwegian Ole F. Bergan, combined with the name of the Norwegian city of Bergen.[citation needed]
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The other type of external frame which recently was proposed, is made from composite plastic which is not flexible like current backpack straps and also it is a kind of material that can be shaped like human spine curvature. In this type of backpack, load directly transfers to the shoulders through the non-flexible straps. This non-flexible structure diminishes the momentum at lumbar region of the back. Strap curvature is shaped close to spine curvature and there are two flexible drawstrings to prevent backpack movement in transverse plane. The straps of this backpack are wide enough to distribute the pressure on shoulders and also a white glass wool layer is added to the internal part of them to absorb dynamic forces, which could be produced through walking. This backpack type is an experimental sample that need further options to be prepared for usage. One of the benefits of backpack with external frame is preventing the spine to incline forward during walking that would be helpful in preventing damage of long term backpack carrying.[4] https://i.pinimg.com/originals/da/68/73/da68737db785708f30ef69ce04411090.jpg
Nordstrom offers a beautiful selection of backpacks for women, whether you're looking for a durable nylon book bag, a versatile leather backpack/purse or a trendy mini backpack. From super-practical backpacks to super-luxe bags, we've got you covered. Nordstrom carries your favorite outdoor-heritage brands—including Jansport and The North Face,—plus top designer labels like Gucci. https://i.pinimg.com/564x/15/4b/26/154b2626893ef6944006eed229da082e--lucrative-lip-gloss-in-color.jpg
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A daypack is a smaller, frameless backpack that can hold enough contents for a day hike, or a day's worth of other activities. They are not large enough for average wilderness backpacking that use full-sized sleeping bags and backpacking tents, but may be large enough for ultralight backpacking. Padded or unpadded waist straps may be provided to distribute weight across the body. https://i.pinimg.com/236x/97/27/5a/97275ad960ae695ea3a793d3e2f62919--long-curls-tight-curls.jpg
The external frame is typically made from aluminum, other lightweight metal alloy, and recently reinforced synthetic polymers or plastic and is equipped with a system of straps and tautly-stretched netting which prevents contact between the metal frame and user's back. In addition to comfort, this "stand-off" provides the additional benefit of creating air circulation between the frame and the wearer's back. For this reason, external frame packs are generally considered to be a "cooler load" than internal frame designs. External frame packs have a fabric "sack" portion which is usually smaller than that of internal frame packs, but have exposed frame portions above and below the sack to accommodate attachment of larger items. In addition, the sack can often be removed entirely, permitting the user to customize the configuration of their load, or to transport a non-conventional load such as a quartered game animal. Military packs are often external frame designs due to their ability to carry loads of different shapes, sizes and weights. https://i.pinimg.com/236x/45/65/e1/4565e1614c03ffdfa979b645aee44007.jpg
Some backpacks are specifically designed to carry certain items. Common examples include backpacks for small valuable items such as laptops and cameras;[10] backpacks designed to hold laptop computers in particular generally have a padded compartment to hold the computer and medium-sized pockets and flaps to accommodate accessories such as charger cables and mice. These are especially common in college and university settings. In order to supply these devices with electricity, a few high-end backpacks are equipped with solar panels.[12]
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The other type of external frame which recently was proposed, is made from composite plastic which is not flexible like current backpack straps and also it is a kind of material that can be shaped like human spine curvature. In this type of backpack, load directly transfers to the shoulders through the non-flexible straps. This non-flexible structure diminishes the momentum at lumbar region of the back. Strap curvature is shaped close to spine curvature and there are two flexible drawstrings to prevent backpack movement in transverse plane. The straps of this backpack are wide enough to distribute the pressure on shoulders and also a white glass wool layer is added to the internal part of them to absorb dynamic forces, which could be produced through walking. This backpack type is an experimental sample that need further options to be prepared for usage. One of the benefits of backpack with external frame is preventing the spine to incline forward during walking that would be helpful in preventing damage of long term backpack carrying.[4] https://i.pinimg.com/236x/22/70/93/227093e0e575cf60ee59fcfd4c18d7ce--my-thirty-one-thirty-one-gifts.jpg
Typical school backpacks generally lack the rigid frame of an outdoor-style backpack and include only a few pockets in the front in addition to the main storage compartment. While traditionally very simple in design, school backpacks are often made with padded shoulder straps and backs as well as additional reinforcement to hold large numbers of heavy textbooks, as well as safety features such as reflective panels to make the wearer of the pack more visible at night. https://i.pinimg.com/236x/fe/96/e7/fe96e7a5c14d871803b3f6d67951acd0--shaving-cream.jpg
Hiking backpacks and backpacking packs are the only choice for carrying your gear on the trail regardless if you're on a casual day hike or a serious backcountry expedition. Similarly, hydration backpacks from brands like CamelBak, are ideal for staying hydrated outdoors on hikes, runs, and bike rides. There are even winter hydration backpacks that are insulated to keep water from freezing in cold temperatures. Travel backpacks offer storage for travel essentials plus handy features that help keep travelers on the move like wheels and detachable daypacks. They remain a popular style carried by students abroad and the jet-set crowd.
Lucky for you, Target carries Jansport backpacks with ergonomic shoulder straps, padded back panels and every other convenience you want—plus the hottest styles to fit your look. Pack up and go with the best backpacks at Target. If a backpack’s not your style, check out our trendy messenger bags for everyday use or our chic selection of carry-on bags for travel. https://i.pinimg.com/236x/a1/16/41/a11641a6a7d742f5e190aebbef60ab2d.jpg
External frame packs were designed to carry heavy loads (>20 kg or 40 lb), giving the wearer more support and protection and better weight distribution than a simple, frameless strapped bag. Wooden pack frames were used for centuries around the world. Ötzi the Iceman may have used one in Copper Age Alpine Italy,[5][6] though some archaeologists believe the frame found with the body was part of a snowshoe. Such packs are common in military and mountaineering applications;[7] metal versions first appeared in the mid-20th century. https://i.pinimg.com/236x/8d/6f/87/8d6f873a5f9b925fe764eecba26a075b.jpg
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