Nylon and polyester are the most popular pack materials.
Oct 28 and Nov 19, ships out within 4 business days Tell us your opinion about delivery time. The total price will depend on the final product features you select. Already added to cart. To solve the problem,you may contact bagstime. The more who buy, the more reward money you earn. Visit Store Favorite Store. We provide waterproof backpack made of high quality material, so that the bags are sturdy and durable. You can buy a kids backpacks and use it for really long. The new material of dakine backpacks also makes it anti-dust and water-proof.
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Do not hesitate to buy now to enjoy fast shipping and the best offer! Advertisement Sponsored Products are advertisements for products sold by merchants on DHgate. 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. 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.
The internal frame backpack is a recent innovation, invented in 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. 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. 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. In many countries, backpacks are heavily identified with students , and are a primary means of transporting educational materials to and from school. The purchase of a suitably fashionable, attractive, and useful backpack is a crucial back-to-school ritual for many students. 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.
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. Common examples include backpacks for small valuable items such as laptops and cameras ;  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. Rolling backpacks are backpacks with wheels on the bottom and an extending handle. 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.
Rolling backpacks are most commonly used while traveling by airplane or train. Hydration backpacks are also available. These light daypacks are especially designed to hold water in a special water bladder also known as reservoir , and their purpose is to allow the carrier constant fluid hydration handsfree, so that the carrier can focus on the mission ahead without having to stop for water breaks.
Backpacks are a standard part of the load-bearing equipment of soldiers, especially infantry , in most countries, and military-style packs are regularly available to civilians in military surplus stores. Such packs are often, though not always e. Each soldier may carry extra weapons, ammunition, rations, medical supplies, tents or other shelter material, and extra clothing.
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.
There is also a small but thriving industry devoted to creating historical reproductions of military gear; such companies generally produce period-appropriate uniforms and other gear in addition to backpacks. Recently, at least one brand of backpack has been specially designed for professional cooks and culinary students. This sort of backpack is meant to safely carry knives, cooking tools, and other miscellaneous equipment such as notebooks, towels, and uniforms.
Specialist backpacks are used by fire services for wildfire fighting, as well as by rescue services for Search and Rescue. 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.
They may include features such as sections for water bladders and specially designed pouches, such as those used to carry personal fire shelters. Backpacks are sometimes used as luggage , particularly as carry-on bags for airplane travel.
In addition to their use in outdoors pursuits, backpacks are sometimes used in other sports as well. Hydration packs , sometimes used by athletes and military personnel, carry water in either a bladder or a rigid bottle and have a tube connected to them from which the wearer can drink without removing the pack; this feature is also included in some more general-purpose hiking backpacks. Backpacks that carry skateboards have also become more popular in the youth culture.
From Wikipedia, the free encyclopedia. For other uses, see Backpack disambiguation. For other uses, see Knapsack disambiguation. Retrieved 5 June
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