Oh! That was unexpected, and sweet!
And I totally agree about Mikkel’s pockets. He has some sort of hammerspace device on him. Just look at the size of his backpack all through A2, and compare and contrast with the amount of stuff they have.
Maybe candle soup taught him to always, always carry rations, and once you are at it, you can take a few other useful things.
He totally could have one too! He recently came to money, and probably spent some on a fine container in Snærri Sluggissons Household Emporium (help for any housekeeping needs! Academy approved!) in Reykjavik.