Waist belts for Insulin Pump Pouches are designed in landscape orientation to fit all commonly used pumps INCLUDING the medtronic 640g. If you prefer a portrait style screen option for the 640g you can find these in the 640g pump pouch section.
The buttonhole is a small slit at the back of the pouch which allows you to thread the pump tubing through neatly. However some people prefer to leave the zip slightly open and have the tubing exit there, it just comes down to personal preference
All pouches are adjustable and have a slight stretch for comfort, waist sizing as follows:
X Large 28-40″
Waist pouches can be HAND WASHED in cool water but please do NOT tumble dry as this will distort the vinyl screen and weaken the plastic buckle clips. You may iron the pouch on a warm setting but place a DRY cotton cloth over the vinyl screen. DO NOT iron directly onto the vinyl as it will melt.