What's the pack size in the stuff sack?

Tech Specs:

Material:

[Shell] Pertex Endurance nylon, 40-denier ripstop nylon; [Lining] polyester 

Insulation:

800-Fill down 

Shape:

Mummy 

Draft Collar:

Yes 

Max User Height:

[Short] 6' 0" (183cm); [Regular] 6ft 6' 6" (198cm) 

Shoulder / Hip / Foot Circumference:

[Short, Regular] 66 / 57 / 42in (168 / 145 / 107cm) 

Stuff or Storage Sack:

Yes, storage sack 

Degree:

20F (-7C) 

Weight:

2lb 1oz (960g) 

Recommended Use:

Camping, backpacking 

Manufacturer Warranty:

Lifetime 

Country of Origin:

China