Expected the thin SUL pillow to sit level with my pad’s 1.5 inch thickness once I was in the bag, but it ballooned up on one side and left my neck cranked the other way. Tried deflating it halfway through the valve. Dropped to under an inch and my head hit the ground on every roll. Switched to loose clothes fill instead. Hit 2.5 inches but shifted every time I moved. Not sure which adjustment actually fixes the angle without adding weight.