Internal Frame Backpacks when of good design and custom fitted correctly will outperform External Fame Backpacks for comfort and functionality. The main factor for purchasing an External Fame Backpack over an Internal Frame Backpack would be to carry large heavy loads over even terrain. Although there is some doubt that Internal Framed Backpacks provide adequate back ventilation, it is important to remember that like External Frame Backpacks, good Internal Frame Backpacks are only in contact with the lower back, upper shoulders, and the chest.
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All Internal Framed Backpack should be personally and professionally fitted, that includes having the Internal Staves contoured to your back regardless of brand, with explicit instruction provided on the use of each adjustment. These Internal Staves must be removed from the backpack and contoured to your back correctly, and not just simply bent in the backpack until the staves are "roughly" the correct shape. Be wary of information stating that the Internal Staves will mould to your back in time, as this is absolutely not true. If faced with this statement, have a demonstration of removing and bending the staves as this should demonstrate the inaccuracy of the statement "It will mould to your back in time". If of course these Internal Staves are soft enough to be bent easily, then the Internal Staves will not maintain the correct contoured shape and provide no load support. Be very wary of correct size of backpack and correct fit to prevent back injuries due to an ill-fitting or incorrect size of backpack.
Most top loading backpacks close with a drawstring and have an extra extension that allows the pack to be overstuffed. All backpacks with an extended loading facility provide a backpack lid that can be extended to cover the top of the extended load. These extendable backpack lids are usually secured to the backpack with two or three extra adjustable webbing straps. An example of when you might overstuff a pack is at the beginning of a long trip when you have lots of food.
Length is most important when choosing a backpack, and it is your Torso Length that determines this selection. There are as a rule five standard lengths of backpacks or more accurately five lengths of Internal Staves used on the global market: White Mountain' uses four of these available Internal Stave lengths and specify each length to be as follows; Extra Small at 50 cm, Small at 55 cm, Medium at 60 cm and Large at 65 cm. Each of these lengths of staves varies by brand at approximately +/- 2 cm and all credible backpack manufacturers or wholesalers will supply the recommended back Torso Length for each backpack. Each backpack Internal Stave length usually accommodates a +/-5 cm variance of the optimum Torso Length. The length of backpack is therefore determined by your Torso Length which narrows your personal choice of backpack capacity.
The maximum capacity of backpack you are able to purchase and fit correctly will depend on your Torso Length, which then determines the total backpack capacity. White Mountain' would suggest purchasing the largest backpack capacity available for your Torso Length, as the really good thing about Internal Frame Backpacks are the compression straps provided when you don't need all that extra space. White Mountain' also suggests the best guideline for choosing backpack size is the longest trip you would take while relying on the backpack to carry all your supplies. This would depend on the type of equipment carried and individual requirements.
We can provide an approximate estimate as follows:
Information should be provided on loading your back pack, which in a custom fitted includes instructions on shifting the weight from the shoulders to the lower back, or from the lower back to the shoulders. If your backpack supplier is not able to offer genuine advice and custom fit the backpack correctly while demonstrating a clear understanding of backpack functionality, SHOP ELSEWHERE! When testing a weighted backpack the backpack should be correctly loaded, loading the backpack incorrectly would give the wearer a completely incorrect assessment of their chosen backpack.
A good backpack will last for many years. Check for durable materials, good straight well finished stitching, bar tacking or reinforced stitching in high stress areas, doubled stitched seams and zippers, quality zippers, quality buckles, reinforced Harness Shoulder Straps and reinforced webbing anchors or handles on travel packs. Enquire about the reputation of the manufacturer you're considering.
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White Mountain' provide an excellent guarantee. From the date of purchase White Mountain' products come with a Lifetime Guarantee against material and manufacturing faults. As can be expected damages caused by fair wear and tear, abuse or misuse are not covered by this guarantee. Please note that this Guarantee specifies the useful life of the pack.
Once you've answered the above questions and you begin to look at and try on specific recommended backpacks the next priorities are:
White Mountain' has done a great deal of research into Internal Stave curvature for each of the four available frame lengths. All backpacks come pre-fitted and provided your choice of backpack is of the correct length, it will be a near perfect contour to your back, this includes online backpack purchases.
I'm going to say that fit is one of the most important elements. I highly suggest you find yourself a store and try on a lot of backpacks. Make sure you properly adjust them. Usually, someone in a store will be able to help you out.
Additionally, the various features you listed are useful for different activities. When buying a pack, consider what you'll be using it for and how long. For instance, my mountaineering pack has loops for my ice axe, a special pouch for my crampons, etc.
If I were planning on a day hike, I would bring my small, 11L pack. If I'm going for a few days, I might go for a 30L pack that has a storage space for my sleeping bag.
Also, you may wish to load the pack while it's in the store with the weight you estimate you'll be carrying. That way, you'll have an idea of how it will feel on your shoulders. Definitely walk around the store at that point.
One of the issues with most purchases is that you won't really know if the pack does exactly what you want until you've used it a good deal :) Live and learn! Identify what you do and don't like and eventually apply that to your next purchase.
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