For a small bag, it can carry a lot! As an example, it can hold all of this:
Passport
The Zip-It is handmade from high quality vegan leather (marine grade) plus cotton fabric, professional grade stabilisers and alloy hardware. The vegan leather is UV stabilised, anti fungal, anti bacterial, super tough and also really light. This isn't cheap vinyl that cracks, scratches or peels after a few uses - it's made for upholstering seats on boats, so it can take wear and weather.
Zip-Its are fully machine washable (cold wash, minimal detergent, hang to dry) and all stress points are double or triple stitched.
Measurements:
Height: 25cm / 10″
Width: 20cm / 8″
Outer pocket: 18cm / 7″