I don't carry decks with me on a daily basis; but if I'm going to a convention or a gathering of friends, I throw my soothsayer's kit into the car, just in case. In it reside (usually) the Morgan Greer, Hanson-Roberts, Robin Wood, Universal Waite, Arthurian (Hallowquest), Legend, mini-RWS, mini-Marseilles, runesticks, rune chips, pendulum, and two or three decks of standard playing cards, and lately the Stairs of Gold and the Knapp-Hall. Only lately I can't find the mini-RWS (last I saw it I was using it for a chatroom Tarot course in our Soothsayers' Guild), and the mini-Marseilles is missing a card (which I just discovered a few days ago--oh well, I can use the spare card, I suppose). I bought the two minis so I could have something to carry around but never did. Now that more decks are coming out in mini size, I should investigate!