It lives in here:@moomin-j have you any pics?

It's got a velcro'd pocket bit to put the gas hoses in:

It measures 300mm high & 500mm round & the top is zipped approx 3/4 way around:

It's made of a waterproof spongy / foamy kind of squishy material & still has plenty of room for more cooking stuff.
Bought from here:
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Shop durable, made-to-measure protective bags and covers for every need at Bags 4 Everything. High-quality, UK-made covers for camping, caravans, outdoor furniture, commercial uses and more.

Speak to a nice guy called Dillon