Would you call it a one hander opening and closing?
You can easily open and close it one-handed using the toggle. Use you ring or middle finger (whichever is more comfortable) on the toggle. The side with the clip on is a bit wider, making it easier to do so if you´re right-handed, lefties can still do it but probably need a bit more practice.
Took me about 15 minutes of playing around with it to get it working and I´m not the most dextrous person in the world.