Costco (Bristol Branch) have 160 x 177cm 430g down camping quilt for around £15, plus lightweight down gilets and jackets, at £15 and £20 respectively. The duvets have been discussed on hammocking forums, and are made by Double Black Diamond. Available in navy, grey and burgendy colours, they are almost as warm as a snugpak jungle blanket/bag and would work very nicely to boost a sleeping bag.
They are filled with, according to the label, 700fp grey duck down, I have no idea on the ethical sourcing of the down.
They are filled with, according to the label, 700fp grey duck down, I have no idea on the ethical sourcing of the down.