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Posts Tagged ‘Heavy Loads’

Backpack designs

Backpacks in general fall into one of three categories: frameless, external frame, and internal frame. A pack frame, when present, serves to support the pack and distribute the weight of its contents across the body more easily (generally by transferring much of the weight to the hips and legs), so most of the weight does not rest on the shoulders, restricting range of motion and possibly causing damage from pressure on the straps. Most are capable of being closed with either a buckle mechanism or a zipper, though a few models use a drawstring for the main compartment.

	All Terain Apex 75 Recycled Internal Frame Backpack in Pinon Green
	10-50076R-38 Features: -Constructed of 450d recycled PET fabric. -Independently adjustable dual density shoulder straps. -X - frame load dispersion suspension system. -Compression molded back panel with contoured lumbar support...

	All Terain Willow 40 Recycled Internal Frame Backpack in Sangria Red
	10-50077R-51 Features: -Constructed of 450d recycled PET fabric. -Shoulder harness and waist belt are ergonomically fit specifically for women. -X-Frame load dispersion suspension system. -Compression molded back panel with contoured lumbar support...

	Ventra Pack 2-in-1 Chest Pack / Slim Shoulder Sling Messenger Bag
	VentraPack positions frequently used accessories within sight so you don't waste time un-strapping and removing your backpack to find your camera, sun-block, etc. while on the move. A zipper releases a drop-down work surface with a map window and comprehensive organizer to store items internally; optional modular exterior pouches are available to hold larger contents...

	Burton Transistor Pack, Brodana Jacquard
	The Burton Transistor Pack is more than meets the eye. This is the ultimate travel pack with hideaway, ultra-cush, ergonomic shoulder harness and a removable duffel shoulder strap. The easy access padded laptop compartment fits most 15" laptops, and the separate shoe storage will keep your kicks away from your clothes...

	Skullcandy S2TTBZ-LZ Titan Earbuds, (Purple) Average Rating:
	Full metal housing with titanium drivers.

	Skullcandy S2ASBZ-BG Asym Earbuds, (Black/Green) Average Rating:
	Perfect for activities cable goes behind ears for steadfast hold.

	Skullcandy S2ASBZ-WZ Asym Earbuds, (White) Average Rating:
	Perfect for activities cable goes behind ears for steadfast hold.

	DAKINE Girl's Prom Pack Average Rating:
	Simplify the chaos of any academic institution with the DAKINE Women?s Prom Pack. Before or after the prom years, you?ll appreciate the 1500cu inches of pocket space in the Prom. The padded laptop sleeve keeps your most prized piece of technology safe and an organizer pocket is a good home for your other electronics that you can?t lose...

	DAKINE Men's Campus Pack Average Rating:
	DaKine Laptop Backpack for street or school

	DAKINE Girl's Eden Pack
	Based in Hood River, Oregon, DAKINE was founded in Maui, Hawai'i in 1979 by longtime surfer, Rob Kaplan. DAKINE'S first product, a revolutionary new surf leash, quickly gained worldwide popularity. This first leash led to more surfing related products, built to withstand the punishing conditions of the surf on the north shore of Hawai'i...

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Frameless

The simplest backpack design is a bag attached to a set of shoulder straps. Such packs are used for general transportation of goods, and have variable capacity. The simplest designs consist of one main pocket. This maybe combined with webbing or cordage straps; while more sophisticated models add extra pockets, waist straps, padded shoulder straps, padded backs, and sometimes reflective materials for added safety when the wearer is out at night. In general these packs can be produced inexpensively.

Some outdoors packs, particularly those sold for day hikes, ultralight backpacking and mountaineering are sometimes frameless as well.

External frame packs

The more traditional type of frame pack uses a rigid external frame which is strapped on the back and in turn carries and supports a cloth or leather sack and potentially strapped on items. External frames were traditionally used to carry heavy loads (20 kg / 40 lb and more), giving the wearer more support and protection and better weight distribution than a simple, frameless strapped bag. Wooden pack frames have been used for centuries around the world (Ötzi the Iceman may have used one in Copper Age Alpine Italy , though some archaeologists believe the frame found with the body was part of a snowshoe), and such gear was common in military and mountaineering applications right up to the 20th century ; metal versions first appeared in the mid-20th century, and plastic designs towards the turn of the 21st. Modern pack frames are usually made from lightweight metal tubes, generally aluminium but sometimes also using titanium or scandium alloys. The frame typically has a system of straps and pads to keep the sack and the frame from contacting the body. The open structure has the added benefit of improved ventilation and decreased sweatiness. The fabric part of the pack occupies part of the frame's length, but the frame typically protrudes above and below. These areas of the frame allow bulky items (such tents, sleeping bags, and thermal pads) to be strapped on. Thus the main compartment is smaller than that of an internal-frame pack, because bulky items (tents, sleeping bags, thermal pads) are strapped to the parts of the frame not occupied by the main compartment itself. This may result in a less smooth load (annoying in dense forest) and less control over the movement of the center of gravity of the pack. While less popular than internal-frame gear, some manufacturers (such as Kelty, Jansport, and Coleman) continue to produce external packs, and military packs are often external-frame designs as well.

Internal frame packs

An internal-frame pack has a large cloth section in which a small frame is integrated. This frame generally consists of strips of either metal or plastic that mold to one's back to provide a good fit, sometimes with additional metal stays to reinforce the frame. Usually a complex series of straps works with the frame to distribute the weight and hold it in place. The close fitting of the back section to the wearer's back allows the pack to be closely attached to the body, and gives a predictable movement of the load; on the downside, the tight fit reduces ventilation, so these type of packs tend to be more sweaty compared to external frame packs. The internal construction also allows for a large storage compartment. Internal-frame packs may provide a few lash points (including webbing loops and straps for sleeping bags and other large items), but as the frame is fully integrated and not available on the outside, it is difficult to lash a large, heavy item so that it stays fixed and does not bounce, so most cargo must fit inside. 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, they ride better in activities that involve upper-body movement such as scrambling over rocky surfaces and skiing. The improved internal frame models have largely replaced external frame backpacks for many activities.