They vary depending of manufacturer, but here's some ballpark numbers:
0.8l - 20cm length, 9cm diameter
1.1l - 23cm length, 10cm diameter
1.5l normal - 26cm length, 11cm diameter
1.5l dumpy - 23cm length, 12cm diameter
If your 1.5 is too long, but you need the capacity, why not get a 1.5l dumpy? They're the same length as a 1.1, and only a little fatter.