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Because of the well designed seat post by cervelo, I wouldn't be able to get that under it, but more hanging off the back, with my saddle position. I can ram a inner tube fully under and then put a can of sealant onto that.
@Scilly.Suffolk point! @umop3pisdn I guess you need a 90deg adaptor, but I can't see one.
Zefal and hutchinson versions both have flexible tubes, anyone vouch for either?
http://www.slowtwitch.com/Products/Things_that_Roll/Tires/Tire_Sealants_2765.html
The large Pro tool bottle will hold a Vittoria Pitstop, a spare Conti supersonic tube, a mini pump, a small candy bar phone (e.g. Nokia 2730), a Torx key for the wheel bolts and my car key. Zip-tied and gaffer-taped under the saddle it's well out of the wind.