6 ml bottle in the mini 2.1 will be extremely helpful, everyday. When I get back from my trip, i'll check out the ones from amazon.
They really are making all the difference for me. I use my 2.1s a lot more now. I don't mind changing out batteries when I'm on the move, but I always hated having to refill the juice bottle when I was out and about. The little 6 ml square bottles make the Mini 2.1s just about perfect. And they make the 18490 Woodvil even better. It has become my favorite "in the car" REO.