What will it be used for? Traveling? I'm just curious cause I know your not leaving that thing outside for very long.
I do take a very small and lightweight waterproof cover with me on trips it fits in my pack and doesn't take up too much space. Honestly I like it for 3 reasons:
1) Keeps eyes off it (out of sight out of mind) when I'm in a hotel. Not much and if someone wants it they will take it but whatever
2) Keeps the dew off in the AM so when I get on my ass doesn't get wet.
3) Use it as a dust cover in the coverage
I got them both on eBay for about $20-30 - again nothing special. I just bought the XXL covers on eBay I think one shipped from China with love. LOL