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I dont know about an acoustic but im guessing it will, by my SG and Strat both fit in their hard cases. My P-bass will fit in a gig bag with a little effort too
My Gibson Les Paul Guitar in a guitar case fits perfectly, no wiggle room. I don't believe you can fit an acoustic guitar that has a big wide body like a Martin or Takamine. I suggest you bring your car to a guitar shop that sell cases and try to fit it there.