Its not who, actually in the story it says a whole group of sailors unloosed it.
King Aeolus
Aeolus gives Odysseus a bag full of wind. He instructs Odysseus not to open it right away. The wind will take him in the direction of Ithaca, but if he opens it early, it would have the opposite effect.
Aeolus gives Odysseus a tightly closed bag full of the captured winds so he could sail easily home to Ithaca on the gentle West Wind. It is his hospitality and respect for Odysseus and his doings at Troy that makes him give this gift.
Aeolas gives odysseus a bag of oxhide where he has placed all the winds except the west wind to give the travelers a smooth and fast journey.
Odysseus spent a month in Aeolus’ realm, where the wind god Aeolus provided him with a bag of winds to aid his journey home to Ithaca. After leaving Aeolus, Odysseus and his crew faced misfortune when they opened the bag, leading them off course. This incident ultimately extended their journey, but the initial stay was a month.
Aeolus refuses to help Odysseus a second time, believing that the gods must be against him if he encountered such misfortune after being given a fair wind the first time. He then advises Odysseus to leave immediately.
Aeolus is the wind kingfor the two gifts he gives Odyesseus:1) a fair west wind that will blow the fleet of ships toward Ithaca2) and a great bag holding all the unfavorable, stormy winds
hes the keeper of winds where Aeolus gives him a bag of wind. Odysseus men think hes hiding something from them so they open the bag and the winds rush out where it brings them back to Aeolus who refuses to help them again :)
It gets loosed by the curious deceitfull shipmates of Odysseus while he slept.
The keeper of the winds, Aeolus, gave Odysseus a bag filled with wind so he can reach Ithaca, his home, faster.
Aeolus gave Odysseus the bag of winds as a gift to help him reach Ithaca safely. However, Odysseus' curious crew opened the bag, thinking it contained treasure, which released the winds and blew them off course. Aeolus released the west wind this time as punishment for their failure to reach their destination.
Aeolus, the Greek god of the wind, helped Odysseus to return home to Ithaca by putting the north, south and easterly winds in a bag, leaving only a westward wind to blow Odysseus and his men home. He did all this purely to annoy his brother, Poseidon, Greek god of the sea, who was his cousin. Aeolus told Odysseus never to open the bag, for the winds will be released. Odysseus had no intention to open the bag, but while he was sleeping, one of his crew did, thinking it was some sort of treasure, while Ithaca was in sight. The winds blew Odysseus far off course and closer to other dangers.