External frames are the perfect pack if you need to carry a lot of gear. When it comes to carrying capacity, some external frames blow internal frames out of the water and can carry up to an impressive 200 pounds. Additionally, if you need to carry items that are a little bit more cumbersome, or that don’t fit inside the backpack, you can affix the item to the exterior bars on the frame. An internal frame backpack does not offer this advantage. Another advantage of external frames is the fact that the backpack will not be directly touching your back. This is much more comfortable in warmer climates.