Is this the ultimate festival gadget? The BoomCase is a Self Powered, Portable Suitcase Stereo system that works with your iPod/iPhone or any device with a headphone jack. The BoomCase will last 10+ hours on a single charge (Charger Included). In addition to running on batteries, The BoomCase can also be plugged in when the party goes inside. They are for sale at the BoomCase Store and prices range from $200 – $5000..
More at theboomcase.com