I don't think there's any case designed to fit the Phantom with the PROPS attached, much less the guards... and honestly you don't want to be traveling with props or guards attached anyway.
I got prop guards at first but after a few flights I don't use them anymore for a few reasons:
1) they make a vortex ring state more likely
2) they add weight
3) I don't fly near people or obstacles often
4) proper takeoff and landing
1) Vortex Ring State or VRS: look into this more yourself there are TONS of discussions around here about it but basically if you descend too quickly straight down you're descending into your own disturbed air or "prop wash", the props can't maintain lift and the Phantom falls from the sky. it's quite easy to NOT have this happen by simply having lateral movement as you descend and don't just descent straight down, especially quickly. anyway people say that prop guards cause more disturbed air under your phantom so it's easier with guards than without to experience a vrs.
2) simple. more weight = less flight time
3) I'll put on prop guards if I'm going to be doing low level flying or there's obstacles nearby... trees, buildings, whatever... but most of the time I'm plenty high up where there aren't any obstacles so the prop guards are pointless
4) takeoff and landing are where most people experience tipovers and broken props. Takeoff is easy.. don't be gentle and slowly raise the throttle. when you're ready to take off do a full power, authoritative takeoff until you have at least 1-2 meters altitude.
landings are a bit more tricky, I'm going to just copy/paste one of my prior posts about it:
catching is easier than landing. I found myself tipping and/or breaking props trying to land so I said screw this, I see guys in videos all the time catching their phantom instead of landing how hard can it be? and it isn't. just be safe obviously, keep it higher than you, don't have it moving quickly and reach up and grab the landing gear. make sure to hold it in the proper position horizontally while you bottom the left stick for 3 seconds to shut off the props.
also you feel like a badass

there is an absolutely perfect catch (imo) at the beginning of
this video. notice he has the phantom facing away from him so the right stick movements are "normal"
a lot of people around here agree as long as you take proper care, catching is better/easier/less prone to problems than landing