If you can't find a case, try a jar. Not as safe as a case, but if you're careful it'll work. I have my 8" bong in this exact one (it's 10" long The jar)
Pakkon Wide Mouth Glass Mason Jar, 1 Gallon https://www.amazon.com/dp/B012BBQUGS/ref=cm_sw_r_cp_api_qs8Gyb3YCTNXH
I grind my coffee on a course setting and let it soak 24 hours in a glass mason jar.
I used to soak them in a bag but now I just soak them as-is. After 24 hours, I grab a bowl and pour the coffee through a fine mesh strainer. Since I have a Chemex, I just use that to filter the sediment and get a nice filtered cup. This gives me a coffee concentrate that I usually cut in half with water as I need it.
One cup of coffee beans is about 100 grams. I do 100 grams of coffee(1 cup) to 3 cups of filtered water.
24 soak
Strain and filter
Cut with water and store in that same mason jar(not in a bowl).
Do you think this jar will be ok?