The "Passport" can be worn as a fanny pack or a cross-body bag.  The low profile lightweight design fades away on the body.
 
Pack Build & Design Specifications:
Asymetric Zipper for clean drawstroke or easy access when worn cross body
Cordura® 500D Mil-Spec P42 Frogskin
1"-Wide Mil-Spec Webbing Tail-less adjusting strap
Acetal Hardware
Interior Loop Velcro
Made in USA
 
Apx Interior Dimensions: 8"x5.25"x2.5"
Designed to fit up to Glock19 w/ optic and flush light or similar
Strap adjustable up to 52" 
 
Available as Pack Only or with MARS Lo Pro (+$59)