The conventional wisdom used to be that shoppers went looking for their favorite brands and that consistency of product packaging assured customer loyalty. Apparently marketers now have decided that good old reliable product packaging is making those products invisible to consumers. According to the New York Times, Pepsico (NYSE: PEP), known for its resistance to label design changes throughout its long history, is now changing some label designs every few weeks.

The problem is that, with the internet and hundreds of television channels, it's becoming increasingly harder for marketers to get their messages out to customers. Product packaging now has to do more than simply identify the goods within, but actually reach out and grab your attention. Hence, Mountain Dew bottles that appear to have been tagged by graffitti artists, or Unilever's (NYSE: UN) shampoo bottles shaped like video game joysticks. Target Corp. (NYSE: TGT) has been in the forefront of bringing eye-catching advertising to its themed store aisles.

There are other motives for this experimentation with product packaging as well. Some companies are searching for ways to reduce container sizes and to have less environmental impact. Some household product manufacturers are looking to make their once utlitarian packaging so pleasing that people may be willing to display it in their homes.

And it looks like things are only going to get weirder. Pepsi has a plan in the works for cans that spray a pleasing scent when opened. And you know that product packaging that talks to you can't be that far down the road. If you thought pop-up ads and TV commercials were annoying, just wait for the day you go into the shop and all the products are screaming for your attention.