Yeah that line about seeing guys with packs and thinking we should have done it sooner hits hard. I was the stubborn guy who thought my trusty water bottle was fine, until I spent a whole day constantly running back to refill it like some kind of hydration gofer. The pack lets you just sip without breaking your whole workflow, and honestly, I feel a bit dumb for fighting it for so long. My pride took a bigger hit than my thirst levels ever did.