The Winter Offensive Weapon Case is a weapon case introduced on 18 December 2013 as part of the Winter Offensive update. The weapon case contains CS:GO skins from The Winter Offensive Collection.
This case was the first community-made case featuring some of the most popular skin designs from the Steam Community Workshop.
All community-made cases are yellow as opposed to the Valve-made black cases.
18 December 2013
The Winter Offensive Collection