Mother-in-law pulled out the sewing machine and whipped up a couple Carboy Snuggies out of Double Thick Fleece for me. Took her 1 hour to pattern and sew 2 of them. Fit nicely and long enough to take the 6.5 gal. and can be trimmed for 5gal's. Does a great job keeping the light out. And it sure didn't cost $16 for one!