I'm just trying to save myself money on a 20degree bag, so I'm wondering if anyone thinks it's a safe idea to use a backpacking 40degree bag PLUS a polyester military-style "woobie" or blanket. This thing here: http://www.ebay.com/itm/USGI-Militar...-/390867972622 It's strictly a money thing, I have no philosophical arguments in my favor. I do sleep pretty warm and my hope is to purchase a decent 1 person backpacking tent, although I haven't found one yet and might do something else if it's cheaper. I plan to start my hike the second or third week in June if that helps. Thanks in advance for your thoughts.