All you need to know is that the bike in front of you is lighter than yours. If it wasn’t you’d be in front of them.
The bike behind is also lighter than yours but your so good that they still can’t keep up.
A full 3l camelbak weighs 7lbs plus, weight hardly seems worth mentioning on an MTB. If it really worries you I can safely say that my bike weighs MUCH less than yours. 😆