Mattress protector for comfort mattress when folded

[t6.1]

Hi - I would like a waterproof cover / bag for the comfort mattress when it is folded so when we are putting our tent / grubby hiking bag on it it doesn't get dirty. I have found this:
https://vwcaliforniaclub.com/shop/product/zonesleep-mattress-topper-carry-bag
But designed for a different mattress and doesn't mention dimensions - does anyone please know the dimensions / if it would fit?

The only relevant post I've managed to find for the sort of thing I'm thinking is something like this:

Comfort mattress protector

Finally received my comfort mattress protector, which I ordered at the beginning of June. After numerous enquiries I could not find any company selling a ‘slip on’ mattress protector for when the lower bed is converted back during the day. We like to keep the bed made up and needed something to...

vwcaliforniaclub.com

Tricky to find when you don't know what you're searching for as mattress protector is leading to those for when the mattress is down!

Thanks for any help!

 

[andyinluton]

I don't seem to be able to post a link, but if you search on here for Kampa XL you should find the thread about the £15 lounger chair bags that could have been purpose made for storing the mattress in.

 

[flying banana]

Kampa XL carry bag.

 

[t6.1]

Amazing! Thank you both so much. Perfect!

 

[Vagophile]

I put a reply on https://vwcaliforniaclub.com/threads/comfort-mattress-protector.36628/
Basically the same idea, slightly more expensive!

 

[apreading]

I was recommended one of these: https://www.amazon.co.uk/gp/product/B01N2HPFHA/?tag=eliteelect-21 and it does the job - although £20 so more than the Kampa one if they are £15