Backpacks are sometimes worn as fashion accessories, in which they perform the same function as a purse.Some backpacks are specifically designed to carry certain items. In addition to their use in outdoors pursuits, backpacks are sometimes used in other sports as well.
Common examples include backpacks for small valuable items such as Rolling backpacks are backpacks with wheels on the bottom and an extending handle. They are not large enough for average In many countries, backpacks are heavily identified with 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. 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.
Such packs are used for general transportation of goods, and have variable capacity. The external frame is typically made from aluminum, other lightweight metal alloy, and recently reinforced The other type of external frame which recently was proposed, is made from The internal frame backpack is a recent innovation, invented in 1967 by Greg Lowe, who went on to found A daypack is a smaller, frameless backpack that can hold enough contents for a day hike, or a day's worth of other activities. The load must be dispersed onto the skeletal structure in an even manner, and should not produce unbalanced forces on the body. A pack frame, when present, serves to support the pack and distribute the weight of its contents across the body more appropriately, by transferring much of the weight to the hips and legs. Because of their design, rolling backpacks reduce the strain on the user, though the shoulder straps may be used to carry the pack for short distances when the terrain is not suitable for wheels. Most of the weight is therefore taken off the shoulders, reducing the chance of injury from shoulder strap pressure (many backpacks equipped solely with shoulder straps can affect the posture of a person carrying more than 14 kg (30 lbs)), as well as being less restrictive of the upper body range of motion. Large backpacks, used to carry loads over 10 kilograms (22 lb), as well as smaller sports backpacks (e.g. Cycling hydration packs are six to ten litres sitting high on the back. Running hydration packs are the smallest and lightest, many under 2 litres and most under six litres. These backpacks are generally very modular, allowing the pack to be reconfigured to the users wishes and are designed to load around the wearers hips.
Moneybag and packsack were used prior, and now occur mainly as regionalisms. This improves the potential to carry heavy loads, as the hips are stronger than the shoulders, and also increases agility and balance, since the load rides nearer the wearer's own center of Backpacks can often simply be referred to as "packs", especially in outdoors contexts; though sometimes ambiguous compared to other bags such as Long before its various terminologies began appearing in print, evidence of early backpacks was scarce. Wooden pack frames were used for centuries around the world.
Thirty five up to sixty five litres and above are common. Backpacks are a standard part of the load-bearing equipment of soldiers, especially Many police tactical units, as well as players of military-style combat games such as paintball and airsoft, use these military-style tactical backpacks and webbing for storing gear and ammunition. Rolling backpacks are most commonly used while traveling by airplane or train. Bruce Horovitz, "New 'badge' of cool: High-tech, high-fashion backpacks," Specialist backpacks are used by fire services for wildfire fighting, as well as by rescue services for Search and Rescue.
The simplest backpack design is a bag attached to a set of shoulder straps. Some more recent military/tactical designs, especially the Recently, at least one brand of backpack has been specially designed for professional cooks and culinary students. running, cycling, hiking and hydration), usually offload the largest part (up to about 90%) of their weight onto padded hip belts, leaving the shoulder straps mainly for stabilising the load.
Compression straps across the top of one's body are common as are hip belts. The simplest designs consist of one main pocket. Although daypacks are small averaging ten to thirty litres, all Trekking and Hiking hydration packs are generally the largest and heaviest. They may include features such as sections for water bladders and specially designed pouches, such as those used to carry personal fire shelters. The majority of the load in a bodypack is carried by the hips.
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