What kind of zipper does it have, toothed or coil?

Tech Specs:

Material:

70D PU-coated nylon ripstop 

Volume:

[S] 1220cu in (20L); [M]1895cu in (31L); [L] 2745cu in (45L) 

Dimensions:

[S] 16.5 x 9.5 x 9.5in (42 x 24 x 24cm); [M] 20 x 11 x 11in (51 x 28 x 28cm);[L] 22 x 12.5 x12.5in (56 x32 x 32cm) 

Pockets:

1 Main, 2 end, 1 interior 

Backpack Straps:

No 

Weight:

[S] 12oz (345g); [M] 14oz (395g); [L] 16oz (440g) 

Recommended Use:

Gear storage, travel 

Manufacturer Warranty:

Lifetime