In relation to ultralight backpacks, you can find generally two categories of packs: frameless & inside frame packs. External frames are a different animal altogether and, because I have no experience with them, I cannot give an objective opinion of them. Yet in the world of ultralight hiking & backpacking, external packs don't generally have a place. This article reveals some basic comparisons with frameless & interior frame packs but, by no means, is this a comprehensive report.

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First off, what are the main differences of frameless & interior frame packs? Frameless packs don't have what are called stays, or a basic body outline which supports the structure. These are usually made from aluminum, fiberglass or carbon fiber. Strength is maintained with these lightweight materials. It's generally accepted that a pack at 3 pounds or less is considered ultralight, and some may even stretch that to 3.5-4 pounds. You will discover many quality-built packs within the realms of these two classes. Understanding what kind of hiker or backpacker you are will go a long way in determining which type of pack you should buy.

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Frameless packs fundamentally cannot stand on their own, and when empty, crumble like an empty duffel bag. They are made from thin nylon, strong & abrasion resistant. These packs have become incredibly popular over the last several years, and with the advent of newer materials, these packs just seem to keep getting lighter & stronger. I've kind of had a love-hate relationship with my Granite Gear Virga backpack. It's a frameless pack, and when full, can comfortably carry up to 30 lbs. I've had it stuffed to more than 35 lbs of gear, which isn't recommended by the manufacturer.

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