As long as it of synthetic insulation that doesn't loose it's insulative properties when wet. So it is "warm" when wet. The lowest overnight low temp will probably will be in the 40s. It can snow in the earlier months. So whatever will keep you warm, but is also highly compressible, works.

You provide your own lock. For Ely, the lockers are inside a locked room. If you need more security, then contact NT.

@@Thefriendlyscoutmaster Sounds good, thanks!