The sheet liner/light fleece blanket is a good combination. You need no bag, as all places usually provide blankets. If you can sew, making a sheet liner with pillow sleeve is very easy, in silk or thin cotton or even UL pertex. A fleece blanket can also be used to keep warm as a shawl in the morning or evening...A sarong or pareo will double as lightweight "dress" , towel, and whatever use you can find for it! Add flip-flops for resting of feet and possibly shower...