Ski Jackets London What Are The Packs In The Back Of More Up-to-date Ski Jackets?

What are the packs in the back of more up-to-date ski jackets? - ski jackets london

Recently, I've done ski jackets and ski has a new package on the back of them, I have a vision of what it is to start as well as other jackets and more people to come with them ... Please can someone give me an answer. Thanks