okay, so i usually use cutlery to cut my food since anywhere i might be eating that serves food that would require cutting, ie anything other than a sandwich, will provide it. also that sounds real hygienic, cutting food with a knife you use for other things. stray threads on clothes aren't a problem i tend to encounter too often, and if i do i have scissors at home to deal with them. packages and letters would be delivered to my house where i have both scissors and knives. still not seeing why i'd need to carry a knife with me all day every day.