EasyJet and the RS rolling bag that fits euro standards

That bag is within EasyJet regulations. Be sure that it's not super full and bulging. Since it's soft sided that could make it too thick for the size checking thing.

And when they say one bag, they mean one bag. Be sure to pay close attention all their posted rules and regulations.

David is right. While they don't check your pockets, they are VERY strict on personal carryon items. Don't expect to board with cameras, purses and backpacks draped over your shoulder. At least not without paying their fees.