They did switch a while back but funnily enough the new website now says they are back to Mono... so not sure what’s what.Just got this bag w/my new Serus T... Pretty good bag, but not as heavy duty as a Mono. I guess they made the switch to these recently? Looks like the Rivolta bags. I would’ve rather had a Mono... My guitar arrived at the dealer around Jan. 2019, I think...