This may be the ultimate picnic basket, which is really a suitcase... with fold-out legs to transform into a table... and a built-in speaker system.
If you have an old suitcase lying around, Instructables user Carleyy can help you turn it into a fun picnic table. For the speakers, Carleyy used an inexpensive USB computer speaker system and Minty Boost for the portable power. Youll also need locking leg braces and some wood pieces for the retractable legs. There's even storage organisation inside the suitcase.
This looks like a great project for more outdoor enjoyment.
Suitcase Picnic Table and Speaker System [Instructables]