Agreed! Though flooding a carto IS possibly, if you don't fill it as full as if you were gna use it like normal, its way harder to flood than an atty. They're especially great for getting the hang of utilizing the "unlimited feed" application of the UFS, rather than always keeping the juice control sealed and only occasionally opening it to take a hard quick pull when your atty gets dry. I wouldn't suggest putting punched cartos in the UFS. They'll work fine, but they're actually more of a hassle than using a normal carto.