Commentary for Berakhot 78:10
א"ר אשי חזינא ליה לרב כהנא דנקיט תרתי ובצע חדא ר' זירא הוה בצע אכולא שירותא א"ל רבינא לרב אשי והא קא מתחזי כרעבתנותא אמר [ליה] כיון דכל יומא לא קעביד הכי והאידנא קא עביד לא מתחזי כרעבתנותא
Rab Aahe said : I saw Rab Kahana take two loaves but only break one. R. Zera used to break off [on the Sabbath a piece of bread to suffice] for the whole of the meal. Rabina said to Rab Ashe : But this must have looked like voracity ! He replied : Since he did not act so every day but only now [on the Sabbath] it would not have that appearance.
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
Because it is stated "they gathered twice as mach bread," not that they used it all. Hence to hold the two loaves was sufficient.
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