The massive tube in the downtube bottle cage is a speaker. I understand the peloton will sport them next year. 2 pounds but adds tunes to my rides via the iPod in it and the wireless remote on the bars.
Garmin is the 705. I love it.
Profile design cages on back of seat are to make up for the speaker consumed cage. Still worth the tunes.
Spacers are for my old back.