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Butler, R. Mongabay.

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Paynter, D. "Why Are Ducks Feathers Waterproof." How It's Made Daily. 2011.

Dave Paynter explains why ducks feathers are waterproof.

The Amazon is very wet, so we need to create a waterproof backpack, especially because there is technology inside that is not waterproof.

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"What is Cultural Anthropology." Duke Trinity College of Arts and Sciences.

This is an explanation for students studying cultural anthropology at Duke. It is also a helpful explanation for us.

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Crist, R. Schultz, A. Parsons, J. "Amazon River." Encyclopaedia Britanncia. 2018.

A long explanation of the Amazon and the area around it.

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Backpack Basics

Anders, M. "Backpack Basics." Get Geared Up. 2015.

Mark Anders Describes Backpacks.

For example, comfort is key. There needs to be a good balance between capacity and comfort. There are also 2 different kinds: Internal and External.

We need to know the basics of a backpack so we can make it good quality as well as clever and efficient.

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This pack, The VentaX3, has an extremely watertight design that allows the backpack to be fully immersed in water and still be dry on the inside. A fascinating material called Graphene provides this miraculous ability, as well as a tight sewing technique and multiple layers of protection. Also, the smooth seamless look of the pack provides a confidence to the owner of the power this pack holds. In summary, this wonderful advancement in technology, there is no trouble in putting electronics inside, even if the pack is submerged.

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Very well written.
Revise your paragraph in the following ways:

More transitions and wider variety of word choice.