What size zipper does this bag have? I'm trying to zip it together with a Big Agnes that has a YKK #8.

Tech Specs:

Material:

[shell] nylon ripstop (40D); [lining] nylon taffeta (50D) 

Insulation:

Thermic MX 

Shape:

mummy 

Draft Collar:

yes 

Max User Height:

[regular] 6 ft 5 in; [long] 7 ft 

Shoulder Circumference:

[regular] 62 in; [long] 64 in 

Hip Circumference:

[regular] 58 in; [long] 60 in 

Foot Circumference:

[regular] 38 in; [long] 40 in 

Stuff Size:

7 x 15 in 

Stuff Sack:

yes 

Bag Length:

[regular] 78 in; [long] 84 in 

Degree:

30 F 

European Norm Comfort Rating:

39 F 

European Norm Lower Limit Rating:

30 F 

Weight:

[regular] 3 lb 5 oz; [long] 3 lb 8 oz 

Recommended Use:

three-season camping 

Manufacturer Warranty:

lifetime