From Longman Dictionary of Contemporary Englishcarry something in your head/mindcarry something in your head/mindREMEMBERto remember information that you need, without writing it down Alice carried a map of the London Underground in her head. → carry
Examples from the Corpus
carry something in your head/mind• He must remember the word and carry it in his head for some time, and so is writing from an image.• The amount of knowledge Lee carries in her head is amazing. 