For this task one must ponder sustainability, cost, enviroment friendliness, safety, in store hadling, temperature, customer motivation, etc.
Consumers want convenience but are receptive to practical conservation ideas. Therefore I have conceived the reusable part to double as a prefferred client's ID and ordering card.
I have included a more ample description in my slide presentation.

€20,000 Overall Community Prize
to be defined Sold Idea
Product Design: Help reduce waste from coffee-to-go paper cups and come up with sustainable solutions!
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Submission Period (61 Days)
Atractive Mug
Aktueller Rang: 160©
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Description
carlos
almost 2 years ago
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Useful?
carlos idea owner
The inside cup, if made out of plastic would resemble disposable formula bottles, except this one would have a solid rim of its own. This would be the same way of recycling as the plastic lids already in use. If the cup is made of rubber (latex) it looks more like a condom, again with a hard rim. The advantage of this one is that it is biodegradable. Also that it expands when the beverage is poured in.
What do you think?
Useful?
carlos idea owner
Thanks for your observations.
To fit in a car's cup holder one would have to fold the handle to one side. The handle can also be shorter like on regular mugs.
Since the sleeve is made of corrugated plastic and there is air inbetween, temperature is insulated and you can savely hold the "mug" with your hand instead of holding it by the handle. The handle might not be needed except it helps holding the ends together by incresing the adehering area. It is the barista who secures the cup inside the sleeve and sticks the ends of the sleeve together thus minimising its failure. Disposable diapers hold very well under more extreme conditions for a much longer lapse of time. I guess accidents may happen just as they have happened with cup lids but they can be marginal.
I think a corrugated plastic coffee holder would not be practical to take and reuse becouse no one would want to take for reusing it without cleaning it first. Also attaching a leak proof bottom would not be easy. The two part group is more viable.
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zacharycraig
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carlos idea owner
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Jcampos
However, I really like your idea because it still has that Starbucks feel and look.
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MasterStroke
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Janne
Regarding the production cost of two different materials, I am no expert and leave that to others to discuss...
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Robhoski
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omaroyoun
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sweetmelissa9978
May I ask your opinion of my entry?
http://www.jovoto.com/contests/drink-sustainably/ideas/4793