Exped Camp & Hike Trekking Lite +15F Sleeping Bag Lw Left 7640445458184. The Trekkinglite 10C (15F) sleeping bag keeps you reliably warm on all your trekking tours. It is an ideal 3-season sleeping bag for those who need a little more insulation reserve. Equipped with efficient proportional differential cut and excellent warmth-to-weight ratio. The 3D footbox provides the best insulation. The hood is cut wider and will not constrict the sleeper but still works perfectly when needed.