Yes its the same idea I suppose, in fact I use baby bottle replacement liners in my crashed tanks. In crashs these tanks usually do not survive as the bladder is impalled on the pickup tube. Its a little tricky and a little less durable but on my pylon crash tanks that the hard outer shell is good I replace the bladder with baby bottle liners and use these tanks for some applications other than racing. In fact the four in the Quad are all baby liner crash tanks.

John