פירוש על עבודה זרה 120:1

The non-Jew held this wine inside the jug by holding the broken jug together. The force that he applies to the walls of the jug causes the wine to be prohibited but only for consumption. A Jew may still sell it.

If the split is lengthwise then when he held it together, the non-Jew did something that could not have been done by a heavy weight. But if it split cross-wise, and he just held the top down, then even a brick could have accomplished that. The wine remains totally permitted.