Large haylage/hay bale covers? anyone use one?

got one about a year or so ago and it is still going strong and seems to do the job nicely. Seems to stop a lot of wastage too.
 
I've got one,it's fab! Can't remember where it's from. Have to keep haylage bales outside &
wouldn't be without this.
 
I have 2 and just started using them, theyre ok but i think abit expensive for what they are, also the wind tends to get underneath the top of mine and they need readjusting all the time
 
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