grw800, I used to race cross country in the late 70's and early 80's, and vaguely remember what you're saying, but don't have a name for that item, and haven't seen them in some time.
These days, the guys like the "camel back" packs with big flexible straws so they can drink on the run.
http://motorcycle.motorcycle-superstore.com/motorcycle/Camelback
Also pretty cool looking is the "Sweetcheeks" accessory, which doubles as a seat, to prevent that tiny, wedge-shaped seat from going places only your proctologist should see...
http://cycle-analyst.com/sweetcheeks.htm
Welcome back; you're gonna have a gas!