Just received this in the mail. Bag is very nice, looks like it will hold a ton of stuff. The speakers sound great except when I don't have music playing I get a high pitched whine until I shut off the power switch. I only gave 4 stars because of the stupid fact that the speakers have to have power to play the music. You can't just plug in your phone and go, you have to have the bag either plugged into an outlet or have 4 D-Cell batteries to power the unit. I don't always work where there is a power outlet to plug into and my bag stays in the barn until it is needed so I would have to remove the battery pack and bring in the house otherwise the cold will kill the batteries in the winter. If the speakers operated like a set of headphones this would have 6 stars.