Is that one of them "hook the vacuum cleaner to it" bags ?  

I've got a nylon insulated bib/jacket set too , its nice in down to 20 deg. weather and not to bad after the day warm-up too !   In reality I think its a Snowmobile Suit , but its nice and warm.    

Have you discovered the "Hippo Hands" yet ?  

Is that one of them "hook the vacuum cleaner to it" bags ?

 I don't know why more motorcyclists don't use these things.  I pack for travel consistently and can easily double the amount of content per square inch regarding fabric material using a vacuum sealed system.  Even a small hand pump will work as long as you can create a solid seal.

 Also everything remains clean and waterproof.

So , my pump (12 Volt) for my air mat can shrink my baggage ?

Are we talking about those bags from Harbor Freight ?