I Googled nathan intensity - and came up with a "race vest", is this what you two are referring to?
Seems like 70L is overkill for someone like me.
I've been using hiking lumbar packs and they are not working. Bottle fall out, I hit my elbows on it, it bounces... I also need to stop about every 1.5 miles and water the dogs.
tnx




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