Looks like a banana hammock to me.
Some seatpacks, like this Bontrager, already have one:
Does it cause chaffing on the inner thigh.
Some people are like a Slinky ... not really good for anything, but you still can't help but smile when you shove them down the stairs.
Ride more. Fret less.
$55 seems a bit much, but it would be a great conversation piece tho.
Huh wan't aware there is actually a market for banana holders.
Is that frame black or really dark blue?