What Are All The Straps On Internal Frame Hiking Backpacks For?
internal frame hiking backpack vs external frame backpack
backpacks|Internal Frame packs[/spin] are the current standard pack for hikers and mountain climbers. When Internal Frame packs were still fresh, external frame packs were the hiking pack of choice for both experienced and fresh hikers.
External frame packs are becoming more hard to find these days compared to internal frame hiking back packs. Many hikers are switching to Internal Frame packs for their comfort and stability.
There are many features of Internal Frame packs but their main strength is the suspension system, which really sets it apart from external frame packs.
The Suspension System
This is definitely the most important feature of an internal frame pack. The suspension system gives you comfort and stability even when you're carrying a heavy load.
Minor differences in the suspension system of Internal Frame packs can have a big impact on the level of comfort.
The Hip Belt
The hip belt was originally invented to reduce the pack's sway. Hip belts however did more. They also reduce the weight on the shoulders making the load seem lighter.
Hip belts on Internal Frame packs have gone a long way since its introduction. They've transitioned from Bohemian 2 inch belts of cotton to nylon webbings through Ensolite paddings covered with nylon fabrics and so on.
Note that hip belts perform differently when you put on weight to the backpack.
Make sure you try on your internal frame backpack with at least 20 pounds of weight. Any empty pack would feel good on your back.
Hip belts don't usually present a problem for women because of their wider hips compared to men.
The most important aspect of hip belts in Internal Frame packs is having a good fit. A hip belt that doesn't fit well tend to slip. You can only tighten the hip belt so much and overdoing it can cause pressure sores.
Another important aspect of hip belts in Internal Frame packs is how they are attached. Some are sewn into place, which is good if it fits you, so knowing your torso length is important.
There are also Internal Frame packs that have [/spin]hip belts that can be easily removed and adjusted|removable hip belts that slides under the lumbar pad and catches with Velcro[/spin]. Hip belts with stiff plastic wings that bolts to a framesheet can still be adjusted to fit.
The Shoulder Harness
The shoulder harness in Internal Frame packs have [/spin]gone through minor changes|been subjected to less changes|seen little changes[/spin] compared to the hip belt. However, [/spin]the role of the shoulder harness has shifted from being mainly to put the load on your shoulder to keeping the backpack close to your body|since after the introduction the introduction of hip belts, the function of shoulder harnesses have changed from putting load on your shoulders to keeping the upper part of the internal frame pack close to the body[/spin].
Internal frame backpacks are usually carried close to the body but it shouldn't be so close that ventilation is restricted.
The Sternum Strap
The Sternum strap attaches to the shoulder straps of the internal frame pack. Its purpose is to adjust to bodily dimensions such as neck and breast size as well as changes of the thickness of your clothing.
It is adjusted when the pack is already on your back. Some are elastic, which allows for your breathing movement.
The sternum strap should also disperse the weight at the front and hind end with respect to the spine. The attributes are different for men and women. Men prefer a low and wide configuration for the sternum strap of their internal frame pack while women prefer higher and narrower configuration.
Stabilizer Straps
The critical relation of load-to-back as a result of Internal Frame packs gave birth to the stabilizer strap. It solves the problem Internal Frame packs have with the top part leaning away from the body, pulling annoyingly at the shoulder straps.
The stabilizer strap was originally the feature of Trailwise external frame pack and was added to the internal frame pack suspension system to limit the leaning motion and to adjust the angle between the load and your back.
Stabilizer straps include the ones on the yoke(upper stabilizer or load lifter) and on the hipbelt(snuggers, trim straps, delta straps or load-transfer straps).
Upper stabilizer straps which are connected between the shoulder straps and the pack are meant to adjusted with the internal frame pack on your back and some can be adjusted from both ends which is especially useful when you're tall. It is usually not necessary if it can be adjust the pack to a 45 degree angle in relative to your back.
Snuggers, which are situated at the hipbelt, limit the side to side movement of the internal frame pack and regulate the weight transfer from pack to hipbelt.
Back Panel
Internal Frame packs have back panels that ranges from simple(flat sheet of foam clad in mesh) to elaborate(thermo-molded foam laminates assembled bonded to wicking fabrics). Some back panels even have contours which supposedly molds to your back. You need to choose carefully though because they might not fit the contours of your back and might become bothering instead of comforting.
The back panel is one part of the internal frame pack that is not adjustable. You should choose between designs that distributes pressure or provide ventilation or a balance of both.
The Lumbar Pad
Lumbar pads are a structural element which only exists in internal frame backpacks. They also provide padding over the crucial lumbar spine.
To avoid slippage, a high friction fabric is often required as the downward force is higher on the lumbar pad than anywhere on the hip belt.
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