Some are having issues opening the Pro1.
So just to make sure here a small thread with a few hints. Inspired by this question.
There are (at the least) three ways to open it
The easiest, Lift the back
The classic push front down, horizontal and up
Roll in, push the front UP and then horizontal
See videos later in this thread, As I get stuff moved out of the long one....
ADD: To a more discrete opening with two hands I usually push with one thumb and restrain the rear with the index on the other hand.