Let me explain that what tobacco I have accumulated to date has either come in plastic bags or in the 100 gm, round cans. I know that tobacco can come in smaller rectangular tins and I may order a couple one of these days. How do they open? Like a sardine can with a tab? Or with a can opener? And once opened, is there a plastic lid that comes with the tin to cover them? Or do you open and immediately jar them? Please try to overlook my ignorance! I have simply never handled one!