Skunkabilly,<br><br>I don't know much about Wiggy's bags, but if it works with a compression sack, then some sort of ground pad will be absolutely critical. You will be losing huge amounts of heat through the bottom without one. Please don't consider doing without- in the summer, you'd be better off taking the pad and leaving the bag at home, it's that important.<br><br>Fortunately, they're relatively cheap.<br>