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Final Prototype:

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Second trial:

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First sketch

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A Gastropod, more commonly known as a snail, has a very intricate and unique body that changes when it does.  As a snail grows, its shell does too.  This design helps the snail with protection from predators and other dangers.

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Many sleeping bags are made of thin synthetic wools/cottons, and do not provide adequate amounts of insulation for people to comfortably sleep outdoors.
For less fortunate people that may have no/unstable homes, this sleeping bag can better accommodate them in the cold.  this bag can also be helpful for workers that may work in harsher weather conditions, or simply conditions that may be uncomfortable.
This sleeping bag will help with warmth and protection from those conditions.

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The bag has two layers: one outer weather-resistant layer that is stiff and harder to use in any weather type, and an inner layer made of thick wool to retain heat in any weather.  The bag has one opening at the top, and one zipper that extends down from the top of the right side of the bag, stretching down and around to the middle of the left side of the bag.  there is also an attachable hood that can be used as a pillow, or simply to cover the inhabitants head.

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Just like a snail's shell, this sleeping bag has the ability to expand to meet the length/body of its inhabitant.  This bag is composed of two layers to mimic the multi-layer shell that snails have.

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Extendable, expandable, and portable sleeping bag for growing people.