Portable/Outdoor/Beach speakers for MP3 player?

[Marcos]

Does anyone know of any decent portable speakers? It has to go fairly loud and hopefully provide some bass/mid-range. Must run on batteries.

i dont mind if its a unit with line in, just need to know if there are any particular models out there that are ahead of the competition

 

[Marcos]

They look quite small/tinny, can you give me an idea of their size?

It'll need to be fairly loud if i am to use it at the beach, dont mind if it burns through batts, i have rechargeables