I agree with everyone who says to keep your instruments "out" so you can pick up and play anytime. For me, it's habit. I've always kept my in the case because I had younger, inquisitive sisters; cats; dogs; boyfriends who thought they were Carlini. So, for me, it's just not a big deal to uncase it when I want to play. As a matter of fact, I am so inurred to doing this that I will play for a while, decide I need a morsel of something, put it back in its case, and ten minutes later, go to play and say "Duh?" when I have to uncase it again.

moonjen