A flexible, hollow glass fiber is proposed as a delivery medium of femtosecond pulses. It was shown that ultrashort pulses with a pulse width of 196 fs, energy of 700 muJ, and repetition rate of 1 kHz are transmitted by the hollow fibers with no damage on the fiber. In the fiber with an inner diameter of 1 mm, the transmission loss is as low as 0.13 dB and the pulse broadening after transmission in 1 m long fiber is 17 fs. It is also shown that the numbers of transmitted modes in the fiber are estimated from the pulse broadening width. (C) 2002 American Institute of Physics.