The current boy WOC has a magnetic clasp, but I have the older boy that has a snap closure and it has never opened on me, even if I load it. Maybe it depends on the individual woc, and how well it was made, seems like it’s inconsistent since each piece is hand made. Trendy woc won’t have issues with the strap rubbing, as it’s a different design in regards to the chain. In terms of the strap rubbing under the flap of the other woc, it does do it, but I haven’t noticed any breakdown in the leather there, maybe just like a slight softening, and not visible from the outside of the bag.