Purchased this for trail runs and races after realizing that I didn't need to have 100oz of water contained in a very heavy and hot camelbak. Go to any Ultra and you will see mostly Nathan packs for a good reason. Rides higher and doesn't bounce at all when snugged up. Doesn't restrict movement or breathing and has plenty of easy accessible storage on the front for gels and salt capsules. The shoulder straps are a very thin material with a comfortable/soft brushed texture towards your skin. They seem fragile to me, but I haven't experienced any problems with them after a lot of miles.
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