Medium and large-sized backpacks usually consist of a carrier system centered on a backpack frame, which can be divided into two types: external frame and internal frame.
External Frame Backpack
- Characteristics: The pack is fixed to a rigid frame, commonly made from aluminum alloy. It includes nylon shoulder straps and a hip belt.
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Advantages:
- Easy to load and access items.
- Weight is distributed between shoulders and hips.
- Good ventilation for the back.
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Disadvantages:
- Can get snagged in dense forests or bamboo thickets.
- May lose balance during climbing or skiing due to sudden shifts in the center of gravity.
- Suitable Scenarios: Ideal for long-distance trekking on flat terrain.
Internal Frame Backpack
- Characteristics: No visible frame, slim and tall design, internal aluminum frame, includes a hip belt.
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Advantages:
- Fits closely to the back, distributing weight evenly across shoulders, back, and hips.
- More stable, less prone to sudden shifts in the center of gravity.
- Slim design is less likely to get snagged in dense vegetation.
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Disadvantages:
- Less convenient for loading and accessing items, though this can be mitigated with good packing techniques.
- Suitable Scenarios: Ideal for climbing, walking through dense forests, and bamboo thickets.
Comparison of Internal and External Frame Backpacks
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Center of Gravity:
- External Frame Backpack: Higher center of gravity, around shoulder level or above.
- Internal Frame Backpack: Lower center of gravity, adjustable between shoulders and hips.
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Carrying Comfort and Balance:
- Higher center of gravity is more comfortable on flat terrain.
- Lower center of gravity is better for balancing in climbing situations, preventing swaying at shoulder height.
In summary, external frame backpacks are suitable for long-distance trekking on flat terrain, while internal frame backpacks are better for activities requiring balance, such as climbing or navigating dense environments.