Reddit reviews Celestron - 8”/9.25”/11” Telescope Case - Optical Tube Carrying Case - Durable Case for NexStar 8SE, NexStar Evolution 8, Schmidt-Cassegrain and EdgeHD optical tubes, RASA 8 - Protect Your Telescope
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THE ULTIMATE PROTECTION: The absolute best way to transport and store your Celestron telescope. Works with NexStar 8SE, NexStar Evolution 8, RASA 8, and most 8”, 9.25”, and 11” Schmidt-Cassegrain and EdgeHD optical tubes.EVA MOLDED WITH 1.5” THICK FOAM: Protect your telescope with a hard yet flexible shell and 1.5” foam padding along all walls and above the accessory pouch.INCLUDES WHEELS AND AN EXTENDABLE HANDLE: Durable wheels and an extendable handle allow for easy transportation.CUSTOMIZABLE FIT: Two dense foam spacers and a built-in compression strap allow you to customize the case for each telescope model.BONUS ACCESSORY POCKET: A convenient storage zipper pocket that holds all your telescope's standard accessories with room to expand.
I found the hard case here: Celestron Hard Case
Otherwise look into Pelican cases. They're the industry standard for waterproof, shockproof hard cases. Comes with pick and pull foam so you make whatever shape you need to.
I have an 8SE and I have this case: Celestron Hard / Soft shell
though I can see why you'd want something harder for traveling.