I know that I'm in the minority but after having a third party wallet attachment and then the Apple branded one and having my debit cards get ruined in both I've given up on these magsafe card carriers. Oddly enough it was only my debit card and my old Costco card, so I chalk it up to poor materials on the mag strips on those cards or something, since a couple of my other CCs survived unscathed.
Initially I thought it was a fluke that my debit card stopped being read reliably in magnetic strip readers after being carried around in the 3rd party magsafe wallet for several weeks, but in an abundance of caution I picked up an Apple version at the same time getting a replacement card. Several weeks later the replacement card failed too, along with my costco card not being readable in their gas pumps. I then ditched the use of a magsafe wallet altogether and went back to my bifold in a separate pocket with brand new debit and costco card. It's been several months with no issues.
I just don't trust long term storage near magnetic fields for cards with magnetic strips.