Hikers, campers, hunters and other outdoor enthusiasts have a wide selection when choosing a backpack. The most popular frame backpacks have either an internal or an external frame. Internal frame and external frame backpacks function differently; which type you choose depends on your needs.
Balance
A balanced backpack is important in the back country. Carrying a heavy backpack on narrow trails or over rocks and other obstacles can cause a hiker to lose his balance. Internal frame backpacks provide the best balance because the load sits right next to your body. External frame backpacks aren't as close to your body and can cause you to lose your balance while maneuvering around obstacles.
Weight
Most hikers are concerned with the weight of the items in their backpacks. External frame packs are typically heavier than internal frame packs due to their bigger frames. However, external frame packs can also handle heavier loads than internal packs, which have lightweight aluminum frames.
Comfort
Comfort is a major factor on a long hiking trip. When it comes to comfort, internal frame packs are better than external frame packs. Internal frame packs are made of softer materials and are narrower. External frames have rigid supports that can dig into your back. External frames are much cooler, however, due to the space between the pack and a hiker's back.
Identification
Internal and external frame backpacks are easy to distinguish. On internal frame packs, the frame is hidden inside the pack material. On external frame packs, the pack material can typically be removed from the frame.
Size
Internal frame and external frame backpacks generally range in size from 3,000 to 5,000 cubic inches. For trips of 10 or more days, a hiker might choose a 5,000 cubic inch pack. A 3,000 cubic inch pack might be better for a weekend trip. External frame packs are typically wider and taller.
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