I usually carry parchment (to write quick spells) and string (string magic) in my wallet and i have a mini spell kit of a few herbs and crystals in both my car and my locker at work (and i dont even necessarily always use physical items in my spell work.)
i always think preparation befor a spell is good, but sometimes you just need it there and then

p.s. love the sage thing, i got ask if i had been smoking marajuana once when i forgot to shower after doing a spell before going to work