Every backpacker needs a sturdy and long lasting backpack to carry their gear in. But which one do you get? It needs to be comfortable and hold all your gear easily. If it does not do both of these you will not have a good backpacking experience.
There are two different types of backpacks, the internal frame and the external frame. The internal frame has the frame on the inside and will conform very well to your back. That makes it a very stable pack and allows you to go into areas where it might be more difficult with an external frame. They are usually smaller than its counterpart, which means you can not carry as much, but they make up for it in comfort.
The external frame pack has the frame on the outside and is usually large and will reach over your head while hiking. The stability factor is much lower than the internal frame pack and therefore should be for on trail hiking only. The external will carry more with all it's pockets and larger storage space and it will also have much better ventilation between the pack and your back
When you are deciding between the internal and external packs you will need to look at a few differences. You will need to know how much you intend to carry, whether you need all the external pockets and cavities and what kind of ground you will be covering. All these things together will help you decide which pack will suit you best.
Summary
Internal and External backpacks have their own unique differences, good and bad. You will have to decide which one suits you best. The internal carries a smaller load but is much more stable for the rough terrain. The external carries a bigger load but and is designed for flat terrain.
 2008 JANSPORT BIG BEAR 82 BACKPACK INTERNAL FRAME NWT  US .02 |  5500ci Hydration Internal Frame Hiking Backpack Bag Mix US $39.99 |
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 PRE OWNED GREGORY BACKPACK w INTERNAL FRAME SIZE L US .95 |  7100ci Hydration Internal Frame Hiking Backpack Bag Mix US $43.99 |
 new north face outdoor sport hiking 7010L bag backpack US .99 |  BACKPACK HUGE LOT OF 30 GROUP OUTINGS SCOUTING NIB US $99.00 |
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 Go Lite Quest Womens 4000 Cu In Internal Backpack US 9.00 |  6500CBI CAMPING HIKING INTERNAL FRAME RUNKSACK BACKPACK US $129.99 |
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 The Thirsty Lizard Back Pack Company US .95 |  Osprey Aether 60 Backpack 3500 cu in 57 liters Sm US $149.99 |
 NWT Arcteryx Needle 55 backpack regular pack US 2.50 |  New Army Digital Camo Everest Hiking Backpack US $24.95 |
 Mountainsmith Peak 2100ci Ultralight Pack US .00 |  new north face outdoor sport hiking 6515L bag backpack US $49.00 |
 new north face outdoor sport hiking 50L bag backpack US .99 |  Deuter ACT Lite 4010 Backpack 2450cu in New US $60.00 |
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 70 L INTERNAL FRAME HIKING BACKPACK DAY PACK GRAY 1495 US .99 |  NEW HIGH SIERRA APPALACHIAN 75 FRAME BACKPACK 0 VAL US $121.98 |
 Gregory SPEAR UM 21 internal frame rucksack US 7.50 |  Air Force Battle Uniform Back Pack US $199.95 |
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 DANA DESIGN Bridger Backpack US 8.49 |  new north face outdoor sport hiking 55L bag backpack US $6.99 |
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 REI Metror backpack Youth short adult female US .00 |  Kelty West Coast Hiking Backpack Used US $22.06 |
 HI TEC ODYSSEY 65 BACK PACK HEAVY DUTY WEEKENDER PACK US .00 |  Gregory Z 55 Backpack NWT Z55 LARGE US $119.99 |
 New Internal Frame Hiking Camping Backpack 5000CI 74 US .99 |  NEW Mountainsmith Ghost LT Backpack internal frame US $19.99 |
 High Sierra backpack ART8567 45 US .99 |  new north face outdoor sport hiking 40L bag backpack US $38.00 |
 Gregory Palisade 80 Brand New 09 Iron Grey Size M US 0.00 |  LL Bean Backpack US $4.99 |
 Golite Lite Speed Pack Mens Medium 2009 NEW US 0.00 |  Osprey Aether 70 Size SMALL 2009 NWT sunburst orange US $195.00 |
 NORTHFACE STAMINA 70 HIKING BACKPACK DRK ROYAL BLUE US 5.99 |  NORTHFACE STAMINA 70 HIKING CAMPING BACKPACK BLACK New US $105.99 |
 NORTHFACE STAMINA 70 CAMPING HIKING BACKPACK Green New US 5.99 |  NORTHFACE STAMINA 70 CAMPING HIKING BACKPACK RED New US $105.99 |
 NORTHFACE STAMINA 70 CAMPING BACKPACK NAVY Blue NEW US 5.99 |  Deuter FUTURA 5010 Hiking Backpack Campling Dark Grey US $69.99 |
 Deuter FUTURA 5010 Hiking Backpack Campling color RED US .99 |  Deuter FUTURA 5010 Hiking Backpack Campling Baby Blue US $69.99 |
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