Gravel skin4 vs Adv skin5

I can’t decide between the Salomon gravel skin4 and the adv skin5. 95% of the time will be for trail runs 15 to 25 miles. Primary need is for hydration, only need to carry my phone, headlamp, coat and a banana.

I was set on the Adv skin but now wondering if the new Gravel would suit my needs. Salomon said that the gravel does hold a bladder, so both have that option if I need it.