not an inflatable but
what about a porta-bote/
Supposeldly unsinkable,extremely durable, not too difficult to carry alone and no need for pumping up.
Never used one and the one I saw did not inspire confidence but a recent surf of their (not great) website was enough to make me think it could be a good option if you are stuck for space (like me) as this thing flat packs to 4in deep!
No angler, no matter how good, can catch a fish everytime, but then no fish, no matter how cunning, can resist a fly everytime...