I have 3 that I rotate throughout the year but all get heavy use. I have yet to get flap curl on any of them and my oldest is 4yrs old. When storing them I just take off the strap and put it inside the larger pocket and store it in the dust back upright.My Pochette Métis in Mono Reverse. Soooo beautiful! I’ve been using here every single day since November. So sad since buying her the price has gone up twice, thrice? Question…is there a way to prevent the flap to curl up? And how to store the PM properly if not used for a long time?