Char Broil Performance Grill Cover, 5+ Burner: Extra Large $15.99
I bought this last time it was on sale to protect my performer. This cover is large and accommodates my Santa Maria attachment so I can keep it there with the grill. You can see it in action next to me Weber 26" (on the left). It's pretty thick too though not as thick as my Primo XL cover that protects the Blackstone Pizza Oven. This is definitely a good deal if you need a large cover for something.
