Dust Proof Protective Clothes & Duvet Zip Storage Bag - 52L 5 "Surprising how much this will store!" Ms Fox 07 December 2020 I bought this on the strength of another customer's review which said that it was big enough to store a king-size winter quilt. When it arrived I didn't think it was going to be big enough to house my 12 tog double duvet. Surprise! With some careful folding, said duvet is now in the bag on top of the wardrobe and taking up very little space.