How should you pack a sleeping bag?

[XXL]

Bought a sleeping bad today and the saleperson says one should'nt roll up a sleeping bag but "stuff" it into its bag. Is this true and if so, why? Any advice?

 

[IceCreamMan]

 

[Inprogress]

 

[wooly bugger]

 

[DeepBass9]

 

[Inprogress]

 

[Raka]

 

[Yami 900]

 

[DeepBass9]

 

[Frog]

 

[LeonDude]

 

[Jacko]

 

[XXL]

 

[Fudmucker]

 

[XXL]

 

[BradleyT]

 

[MildDog]