I just ordered one of those silicone stiper bags from Amazon and I am not sure how to use it. Do you have to put these type of bags inside another bag?

Anybody??????

Here's a photo:
http://www.google.com/imgres?q=silicone+striper+pastry+bag&hl=en&biw=1280&bih=632&gbv=2&tbm=isch&tbnid=Pv4Is67ZwddYQM:&imgrefurl=http://www.globalsugarart.com/cat.php%3Fcid%3D314%26s%3D60&docid=IrGlOCVPJRaG0M&imgurl=http://www.globalsugarart.com/product_images/24244_OW4V1FH5_465.jpg&w=223&h=200&ei=P7fqTuPnN7GnsQKi5ozkCQ&zoom=1&iact=rc&dur=359&sig=105482775013929413782&page=4&tbnh=124&tbnw=141&start=62&ndsp=21&ved=1t:429,r:6,s:62&tx=78&ty=51

Is this it?
I'd say, "Yes", otherwise how would you use a tip with it.
(It says it comes with instructions... did it?)