We tested these packs by using them — a LOT. They are designed for use on trail or ultra runs, so that is how we chose to use them. We wore them daily on our local trail runs in the San Juan Mountains of Colorado. We also used them on our long runs in the mountains or desert, and loaded them up with everything one might need for these adventures to see how well they worked.
Hydration packs for running are a key accessory for long runs in the mountains when food, water, a camera, map, and of course rain clothing are all required.
We gave them to other runners to test, and asked for the impressions of runners we saw wearing these products. Lastly, we wore them during ultra races, one of the ideal usages of these packs. Running for 50 or more miles while wearing a pack will really tell you whether they are comfortable or cause chafing. Races where these packs were used are the Jemez Mountain 50 mile in New Mexico, the Bighorn 100 mile in Wyoming, pacing during the Hardrock 100 in Colorado, and during the IMTUF 100 in Idaho.
We used these packs on long runs and in ultra races to test their effectiveness. Here testing the SJ Ultra Vest 2.0 at the Jemez Mountain 50 mile in New Mexico.