It all started when...
This is the first subscription that started my addiction. Here is a description direct from their website:
A monthly mystery crate for pop culture fans filled with incredible and exclusive items and apparel from your favorite tv shows, movies, games and more! Over $45 value in very crate.
The monthly subscription runs you around $21.95 a month which includes shipping. If you're interested in signing up for Loot Crate, then go ahead and click the button below.