Arcana Coelestia #4698
4698. 'Were bowing down to me' means worship. This is clear from the meaning of 'bowing down' as worship, dealt with above in 4689.
Sack
'A sack' in Genesis 42:25, means a receptacle, and here 'a receptacle' on the natural level, because it is a story about the truths and scientific ideas which are on the natural level. 'The sack' in this passage specifically signifies scientific ideas, because 'a sack' is a container of grain, so the scientific thought is a receptacle of good, and in this specific instance, the good which is from truth.
(References: Arcana Coelestia 5489)