I use two $5 cheap fleece blankets from target. Lay a blanket down then 1st window fold the other half of the blanket on top then second window then second blanket last window and fold blanket on top. Roll it up and then stick it in an xl folding camp chair bag that I bought at homedepot for $12(bought the chair just for the bag!). The regular size camp chair bags are too small. Find a "XL". $22 for everything. I Used it all last summer and it worked great.