In reply to PeterM:
As a user of both types, when the camelbak insulater tube is wet, like when you're washing it, it slips straight off with little effort. This is handy for seeing if there's ant mould growing in it too.
Handily, when still in the soapy water the insulater will also slip on the tube for the platy with the minimum of fuss.
I keep mine in the freezer to stop the march of bacteria, it can slip off and on when frozen too.