Another rather unique cruise ship rule has been explained by one of the world's largest cruise lines, Carnival.
A subsidiary company of Carnival Corporation & plc, Carnival Cruise Line stands next to Royal Caribbean as the two largest operators in the business.
In transporting millions of sun-seekers around the world every single year, year in, year out, they have a hefty list of rules that you need to follow in order to make sure things don't go wrong.
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That includes a ban on particular cleaning products that many people like to bring on board and get taken off of them at port security.
Of course, there's also other forms of rules, such as a newer age ban brought in by both Royal Caribbean and Carnival. And as with many rules, there are exemptions to this.
The cruise line's website is a great place to look if you want to see the general list, including 27 items forbidden with Royal Caribbean.
Well, a more niche ban over with Carnival revolves around toilet rolls and using such an item in your cabin bathroom.
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We all know the purpose behind it. And that is exactly why the ban is in place according to Carnival's Brand Ambassador, John Heald.
Heald took to his Facebook page to reveal he was asked if passengers could bring their own hand sanitiser on to the cruise for their holiday.
And in confirming customers can do this, he revealed another question one passenger sent his way.
He said: "I was asked if you can bring your own brand of toilet paper on board which you cannot because it damages and blocks many toilets in the cabin section."
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Yep, you can't bring your own toilet roll because it'll block the toilets or further down the plumbing line in the ship.
As you can probably imagine, if there's thousands of guests doing this every day with the wrong loo roll, the situation could be pretty gross.
Most bathrooms on a cruise ship will have warning signs in the lavatories saying you shouldn't flush items down the toilet.
"With an intricate plumbing and sewage system, cruise ships must use toilet paper that can dissolve quickly and easily. Marine evacuation systems, which help process onboard sewage, are unable to process the plushy, double-ply toilet paper you might use at home," the team over at cruise.blog writes.
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"Additionally, cruise ships continue focusing on sustainability by minimising their impact on the ocean.
"For this reason, cruise ships use marine-grade toilet paper, which is likely more environmentally friendly and biodegradable."
Some have taken to social media to say they have been allowed to bring their own loo-roll on to a cruise ship, but were told it must be put in the toilet.
Depending on what you're using the toilet paper for, we highly recommend you stick to the stuff you're given for free by the cruise line. Urgh.
Topics: Carnival Cruise Line, Health, Travel, Cruise Ship, Holiday, Facebook, Social Media
Tom Earnshaw