Zefal Spy Bicycle Mirror
Tiny but will attach to any bar and bar end without any tools required.
HotHands Toe Hand & Body
Will keep your extremities warm far below freezing range with no electricity.
Silk Glove Liner
An all silk liner for when you must pull your hands out of the mitten.
Merino Wool Balaclava
The most compact folding bike that still rides well and has electric and titanium versions.