Capacity and Depth of Hell

On the Day of Judgment the inhabitants of Hell will see their destined abode face to face and will realize the error of their ways. But, of course, it will be too late. The Qur'an states: "No! When the earth is pounded to powder, and your Lord comes with His angels, rank upon rank, and Hell, that Day, is brought [face to face] - on that Day will man remember? But how will that remembrance profit him?"
[al Fajr, 89: 21-23]

"On the Day We will say to Hellfire, 'have you been filled?' it will say, 'Are there some more?'"
[Qaf, 50: 30]

Ibn Mas'ud (radiAllahu anhu) reported that the Messenger of Allah (salAllahu alayhi wasalam) said: "Hell will be brought on that Day. IT will have seventy thousand reins with seventy thousand angels drawing it by each rein."
[Muslim]

Abu Hurairah (radiAllahu anhu) reported that the Prophet (salAllahu alayhi wasalam) said: "And his (the disbeliever's) seat in Hellfire is as much as (the distance) between Makkah and Madinah."
[at-Tirmidhi and al-Hakim]

Abu Hurairah (radiAllahu anhu) reported: "While we were in the company of Allah's Messenger (SAW), we heard a terrible sound. Thereupon, Allah's Messenger (salAllahu alayhi wasalam) said, 'Do you know what that sound is?' When we answered, 'Allah and His Messenger know best.' He said. "That is a stone which was thrown into Hell seventy years ago and has been constantly falling until now when it finally reached the bottom.'"
[Muslim]

Abu Hurairah (radiAllahu anhu) reported that Allah's Messenger (salAllahu alayhi wasalam) said: "Hell and Paradise fell into a dispute during which Hell said, 'I have been distinguished by the proud and the haughty.' And Paradise said, 'What is the matter with me that only the meek and the humble and the downtrodden and the simple enter me?'
Thereupon, Allah said to Paradise, 'You are the means of My mercy whereby I show mercy to those of My servants whom I wish.' Then HE said to Hell, 'You are the means of punishment whereby I punish those of My servants whom I wish. Both of you will be full.' Hell will not be filled up until Allah puts His foot over it. Then Hell will say, 'Enough, enough, enough,' at which point it will be filled up, all of its parts integrated together."
[Muslim]

Anas bin Malik (radiAllahu anhu) reported that Allah's Messenger (salAllahu alayhi wasalam) said: "Hell will continue to ask, 'Is there anything more?' until Allah, the Exalted, and High will place His foot thereon, Then it will say, 'Enough, enough, by Your honor,' and some of its parts will draw close together.'"
[Muslim]