Here is my .02 worth:
The cover that came with my bike weighs almost nothing and packs really small. When I am camping I can put a lot of my gear on the seat and cover the bike. Besides protecting it from prying, curious eyes, it also keeps the dew and rain off my bike.
However, once I saw a big storm coming and covered the bike. That was a mistake as the cover acted as a sail and my fell over. Paul
Life is suffering until you realize that life is suffering.