Searching for Good Sand Saddle Bags

I found these on Amazon.ca but sent them back as they are useless. There are supposed to hold 20lbs of sand 10lbs each side but when you put just 5 or 6 lbs of sand in them you can't even close the darn zipper. Emails to cowboy studio have gone unanswered.

http://www.amazon.ca …ywords=cowboy+s​tudio+bags

I know I can make them myself but I don't have the time so I am looking for a reasonably priced bag that will take the sand it says it will take and close the zipper properly

Any suggestions?

Prefilled but up to 35#. http://www.sandbagstor​e.com …ddle-sandbags--black.html

I opted for lead bars as opposed to sand. More compact and less mess. Bought on eBay.