“Here’s one that everyone will use, at one time or another. Nothing more than a large seven mil thick plastic bag, it is called the “concrete mixing bag” and comes from a company called The Cement Solution Co., LLC.

Here’s the way to use it:

• First, place your bag of ready mix concrete or mortar so that it is standing on end.
• Next, cut a slit in the top of the bag.
• Next, place the concrete mixing bag upside down over your bag of ready mix.
• Invert both bags at once and pull the paper ready mix bag out of the plastic bag.
• Then add water, tie off the top of the sack (using the Hook & Loop Strap) and roll the bag around (rock back & forth for 60 seconds) to mix the ingredients.
• Finally, pour the mixed concrete and rinse out the bag. You want to make sure to rinse the bag because the manufacturer says it can be used 30 to 40 times.”

The Bakersfield Californian – June 7, 2006.