Sleeping bag

New and Old

I bought sleeping bag last evening, because old one is too large to pack in my baggage.
New sleeping bag can be used until 6℃. It will be under 5℃ at the mountain over 3,000m. So, I have to sleep in this sleeping bag by wearing over wear.
The reason why I didn't buy sleeping bag which apply to more low temperature is that it is large and expensive.