"The Messenger of Allah ﷺ used to perform Ghusl from a vessel which was the size of a Faraq [1] and he and I used to perform Ghusl from a single vessel." [1] See No. 230  

كَانَ رَسُولُ اللَّهِ ﷺ يَغْتَسِلُ فِي الإِنَاءِ وَهُوَ الْفَرَقُ وَكُنْتُ أَغْتَسِلُ أَنَا وَهُوَ مِنْ إِنَاءٍ وَاحِدٍ