Using The Straps On Internal Frame Backpacks
internal frame hiking backpack vs external frame backpack
Internal frame hiking Internal Frame packs are the current standard back pack for back packers and mountain climbers. When Internal Frame back packs were still new, external frame back packs were the hiking back pack of choice for both experienced and new back packers.
External frame back packs are becoming more burdensome to find these days compared to Internal Frame back packs. Many back packers are switching to Internal Frame back packs for their comfort and stability.
There are many features of Internal Frame back packs but their main strength is the suspension system, which really sets it apart from external frame back packs.
The Suspension System
This is probably the most critical feature of an internal frame back 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 back packs can have a big impact on the level of comfort.
The Hip Belt
The hip belt was originally invented to reduce the back 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 back packs have steadily changed over the years. They’ve transitioned from familiar 2 inch belts of cotton to nylon webbings through Ensolite paddings covered with nylon materials and so on.
It’s important to note that even when hip belts feel right when you first try the internal frame back pack on without any weight in the store, out in the field with full camping and hiking equipment on your back you might feel much more differently about it.
To have a rough feel of how the hip belt is going to feel on your hiking trip you should have at least 20 pounds of weight in your back pack. Any empty back 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 back packs is having a good fit. A hip belt that doesn’t fit well tend to slip. Tightening and hitching have their limits and they can cause pressure sores.
Another important aspect of hip belts in Internal Frame back packs is how they are attached. Some are sewn into place, which is good if it fits you, so measuring your torso length is important.
There are also Internal Frame back 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]. Some hip belts have stiff plastic wings that bolts to a framesheet, adjusting to the angle of taper over which go molded, segmented pads of firm foam with a soft, wicking liner like the ones you see in Gregory’s Internal Frame back packs.
The Shoulder Harness
The shoulder harness in Internal Frame back 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 back pack close to the body[/spin].
The internal frame back pack should be near enough to the body to harmonize your movement but not too near that it becomes hot and confining.
The Sternum Strap
The Sternum strap attaches to the shoulder straps of the internal frame back 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 can be adjusted without having to take off your internal frame back pack and all have a clip buckle. Some Internal Frame back packs have a sternum strap with elastic tension loop that allows you to breathe.
The sternum strap should also diffuse the weight at the front and back with respect to the spine. The attributes are different for men and women. Men prefer a low and wide profile for the sternum strap of their internal frame back pack while women prefer higher and narrower profile.
Stabilizer Straps
To further limit the movement of the backpack and hence give it more stability, stabilizer straps are introduced. It solves the problem Internal Frame back packs have with the cylindrical top leaning away from the body, pulling annoyingly at the shoulder straps.
The stabilizer strap was originally the feature of Trailwise external frame back pack and was added to the internal frame back 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 back 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 back 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 back pack and regulate the weight transfer from back pack to hipbelt.
Back Panel
Internal Frame back packs have back panels that ranges from simple(flat sheet of foam clad in mesh) to elaborate(thermo-molded foam laminates assembled joined to wicking fabrics). Some back panels even have contours which supposedly molds to your back. You ought to be careful though because they might not fit the contours of your back and might become irritable instead of comforting.
The back panel is not adjustable and it would be nice if is changeable. Each design offers different advantages whether you want better ventilation or better pressure distribution.
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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