Blackburn Airstick SL. All you need to know. Fits in the smallest seatbags at 160mm (cigar size), Lifetime guarantee, rebuildable, inflates to 160psi and weighs only 58grams. About $30 at Canadian Sportcheck stores

Blackburn Airstik SL - Blackburn Airstik SL is one of the smallest and lightest pumps you can find on the market. A unique two chamber design makes for 37% more air per stroke when compared to other pumps at the same size. There is an aluminum barrel and shaft. The whole pump is rebuildable if needed. This is a presta specific head only. This pump weighs only 58 grams. There is a cage mount included. The max pressure is 160 psi. Comes with Blackburn’s lifetime warranty.
(Picture borrowed from Trisports)