Dicho: On a long journey, even a straw weighs heavy.

Dicho: On a long journey, even a straw weighs heavy.
 

I ran across a Spanish proverb in English that goes like this.

On a long journey, even a straw weighs heavy.

It said it is a Spanish proverb. Can anyone tell me what the original version of this is in Spanish?

Thanks guys. :)

“En largo camino una paja pesa” (En un largo camino, hasta una paja pesa)

Many thanks Sosia, I needed that for a blog post I was writing. :)