Today, we were looking for the best transport suitcase for our brother knitting machine. We travel a lot with it and during the last travel damaged machine a bit. Pelican is known for resistance travel cases used by US-Army. The model Pelican 1750 is designed for gun transportation, but it has perfect size for the knitting machine:

53 x 6.1 x 16 inches - (134.62 x 15.49 x 40.64 cm)
24.4 pounds - (11 kilos)

http://www.amazon.com/Pelican-1750-Case-Rifle-Black/dp/B000AOMA1S/ref=pd_sim_p_4

if you know a better suitcase option please share with us.