"The Messenger of Allah (ﷺ) used to perform Ghusl from a vessel which was the size of a Faraq and he and I used to perform Ghusl using a single vessel." Sixteen Ratls.
Sunan an-Nasa'i Book 1, Hadith 229
← Previous Hadith "I heard Abu Salamah say: 'I entered upon 'Aishah and her foster-brother was with her. He asked her about the Ghusl of the Prophet (ﷺ). She called for a vessel in which was a Sa' of water, then she concealed herself and performed Ghusl and poured water over her head three times.'"

Sunan an-Nasa'i Book 1, Hadith 228 Next Hadith → "I heard Anas bin Malik say: 'The Messenger of Allah (ﷺ) used to perform Wudu' with a Makkuk and Ghusl with five Makkuks.'"

Sunan an-Nasa'i Book 1, Hadith 230