The Horizon Case is a weapon case released in 2018 that holds 17 weapon skins, from Mil-Spec Grade to Covert, with knives as its rare special item. SkinsMonkey lists every Horizon Case skin with prices for each wear level.
The horizon case was released as a part of a regular update for CS2(CS:GO) on 3rd of August 2018. The case released in this update contains 17 weapon skins for CS2(CS:GO), with a chance to open one of the 4 special rare knife skins. Each of the knife skins released in the horizon case can also be opened in one of the 13 different finishes.
To open the weapon case released as a part of this update you will need a horizon case key. You can buy it in the Steam store, trade for it on the Steam community market or buy it from one of the trading bots.
When you open the horizon case, you can get one of these skins:
The 17 weapon skins from this container make up The Horizon Collection, the set that counts in trade-up contracts. The knives it drops as rare special items belong to no collection.