All our (bike) bags are made with only the best materials. For every cycle bag we have a matching and fitting shopper! To do so go to the page " customize your bag" 

Sizes (outside) 

XL: L 40 x B 18 x H 32.
L : L 35 x B 18 x H 32.

XL 44 liter L 38 liter

For a fast overview, watch this Youtube link