You stick a $3500 keyboard in a crappy bag, soon you got a $3500 doorstop. Unless you plan on changing arrangers every two months, I recommend a hard case. Get a dolly. Stop whining.

Or start whining about how banged up your new arranger has got...

Sooner or later, something WILL happen to it. An enthusiastic waiter will put a speaker on top of it. It will tip over while you open a door. It will rain while you go inside for a pee. A drunk will fall on it. Dogs and cats, living together, mass hysteria...

Look at the available cases, then picture them dealing with the above. Then picture your new arranger. In pieces.

'Nuff said...
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An arranger is just a tool. What matters is what you build with it..!