I have an Explorer Classic + Hennessy's Super Shelter. Inside the hammock I use a British Army surplus cold weather sleeping bag. This sleeping bag design has its zipper (double sided) down the top centre of the bag + an enclosed footbox. Easy to use in a hammock because, with the zipper open and the two top halves laid, out you can lie straight back onto the bottom interior surface, lift your feet in and tuck them into the footbox, and then slide the zip closed using the inside loop on the zipper.