I've carried one of these carton cutters unobtrusively in my shirt pocket for years. Replaceable bladed, one-handed opening, sheeple-friendly, it gets used almost every day. Love it. Don't know I have it on me till I need it, and then it's there, flat and invisible in my pocket. Wish I could buy one of stainless steel, high quality, rather than the throw-away quality of the one I have, which has nonetheless been in my pocket for 4 years (original cost $0.50).