object
Skíðblaðnir
Freyr's magical ship, built by the dwarf sons of Ivaldi: big enough to carry all the gods, always with a fair wind, and foldable to fit in a pouch.
Skíðblaðnir is the ship of Freyr. Grímnismál says "Ivaldi's sons" made it in days of old, "The best of ships for the bright god Freyr" Grímnismál 43, and ranks it beside Yggdrasil and Sleipnir as the best of its kind: "Skithblathnir best of boats" Grímnismál 44.
Snorri adds the details. The ship can carry all the Æsir with their weapons, it has a fair wind the moment its sail is raised, and when it is not needed it "may be folded together like a napkin and kept in one's pouch" Gylfaginning 43. Skíðblaðnir is "best of ships and made with most skill", though the largest ship is Naglfar Gylfaginning 43. In Skáldskaparmál Snorri tells how it was made: Loki, having cut off Sif's hair, got the sons of Ivaldi to forge new golden hair, and they made the ship and Odin's spear Gungnir as well. Loki then gave Skíðblaðnir to Freyr Skáldskaparmál 35 (see The treasures of the gods: Sif's hair and Brokkr's wager). The poets call Freyr its "possessor" Skáldskaparmál 7.
No surviving myth shows the ship actually sailing. It belongs to the lists of wonders rather than to the stories.
In the sources
Quoted from the hosted translations; each line is checked against the text when the site is built. Select a reference to read it in context.
In days of old did Ivaldi's sons Skithblathnir fashion fair, The best of ships for the bright god Freyr
The best of trees must Yggdrasil be, Skithblathnir best of boats
it has a favoring wind as soon as the sail is hoisted, whithersoever it is bound; but when there is no occasion for going to sea in it, it is made of so many things and with so much cunning that then it may be folded together like a napkin and kept in one's pouch.