A classic leather document pouch, 4 x 11" overall, with a brass zipper and a lengthwise panel inside to separate paperwork as needed. No matter how large or awkwardly shaped the document, one or two folds will make it fit for quick access when you need it. Works with passports, airline tickets, itinerary, hotel bookings, etc.
Anxiety-free travel these days (especially overseas with multiple travelers) requires organization. This handsome and exceptionally well made pouch (sourced here in the USA by one of our staff for whom it’s a personal godsend) will do the trick. Highly recommended.