If you are looking for a vest that balances comfort, capacity, and price, the Active Skin 8 is an excellent choice! It is not overly large, but offers satisfactory space for hydration (2x500ml flasks provided and placed in the front pockets and secured with loops, internal space for a bottle (500ml and/or bladder) and equipment (front pockets for keys, bars, gels, phone, elastic slots for various accessories, back space comfortably fits a windbreaker and a technical t-shirt with room to spare). Especially for keys, small wallets with a ring, etc., the back compartment has a special hang clip to hang and easily find these items.
Additionally, there is a bladder compartment between the back and the main storage area (access from the collar).
I find its pockets very ergonomic, as they are positioned on the vest. They suited me from the first run.
The Sensifit really works because on a 20km run, with quite a few things + a bottle in the back, I didn’t notice any shaking or noise, it was stable and fit my body just right.
The cord is elastic and tightens as much as you need (with a stop button).
I haven’t hung poles at the front to evaluate this feature, but I believe it’s possible, judging by the loops it has on the left and right.
I have also used it as a cycling vest, with a 1.5 lt flask (from Decathlon, same quality as Salomon’s, more economical) and it worked just fine.
As for whether it is warm or not, during the warm season, I have to say that both Sportiva and North are just as warm. The positive thing is that it dries relatively quickly and can be used for double training sessions (e.g. morning, afternoon).

The size L fits my body type correctly (1.82/75).