What does the idiom carrying straw to Egypt mean?

The idiom "carrying straw to Egypt" is not a common English idiom. It's likely a misunderstanding or misremembered phrase.

There are a few possibilities:

* Carrying coals to Newcastle: This idiom means doing something unnecessary or redundant, as Newcastle was already famous for its coal mining.

* Carrying water to the sea: Similar to "carrying coals to Newcastle", this idiom also emphasizes pointless effort.

If you can provide more context about where you heard this phrase, it might be possible to clarify what it meant.