My son needs to build a hot thermos for school and needs help. Thanks.
By tom glenn from Mississauga, Ontario Canada
You could use the foil covered bubble wrap-like stuff that car windshield sunshades are made of. Wrap it around a container, and duct tape securely, decorate if necessary with Contact paper, decals, etc. If you don't have any sunshades to spare, use bubble wrap and aluminum foil. I kept horse water buckets from freezing solid that way. (12/10/2009)
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