Reference for Shabbat 253:11
ועדיין תבעי לך חד גברא מפני ליה לכולא או דילמא כל גברא וגברא מפני לנפשיה
Come and hear: For one [Baraitha] taught: One may clear away even four or five tubs of pitchers of wine and oil; whereas another was taught: In ten or fifteen. Surely they differ in this, viz., one Master holds: It is better to minimize the walking; while the other Master holds: It is better to reduce the burden? — No: All hold that it is better to reduce the walking: do you think that ten or fifteen refers to 'tubs'? [No]; it refers to the pitchers, yet there is no contradiction: here [in the first the reference is] where they can be carried [only] singly in a tub;<span class="x" onmousemove="('comment',' Being too large to be carried more than one at a time. ');"><sup>8</sup></span>