I kept my old carts (Mach 3) in a drawer for just over a year - figured I'd used them when in a hurry or traveling. But after a year of zero use they got tossed in the trash. Thing is, when you get "good" at DE shaving it's no slower than with a cart - I face lather soap and that takes less than 30 seconds. Then a quick 2 pass shave is just as fast as with a cart once your technique gets good. When I travel I bring my equipment minus the blades and then just stop at a drugstore on location for blades. Even the most garbage DE blades are better than carts IMHO.