Ultimate Direction Fastpack 40L Daypack for Running, Trails, Hiking, Cycling, Mountain Biking, Ultra Marathon, or Travel

I ran a 250k, self-supported multi-day stage race with UD40. It was great overall and held up pretty good except one disappointment which I’ll detail below.Since it was a self-supported race, I had to carry everything I needed from food to bedding for 6 days. I was able to comfortably fit everything and the pack weighed 21lbs all in!I had to carry my pack with me on the plane as cabin baggage and it fit very comfortably in the overhead cabin space (business).The UD35 would have been the perfect size if only it had two holders for water bottles, but it only had one so I went in for the 40L. In the UD40, I was comfortably able to fit in two bottles 750 ml each on the bottle holders which were on the shoulder straps!I also carried gels and supplements in 4 pouches which were on the outside of the bottle holders on the shoulder straps. So they were very easy to retrieve.Outside, on the bottom of the straps there are two large pouches where you can stuff other things like nutrition bars. Because the fabric is stretchy you could easily stuff in at least 4 nutrition bars on each pouch.There are also two zippered compartments behind these pouches where I carried my sunglasses and my phone!I attached a sleeping bag on the outside using bungee cords. There are loops all along the outside and bottom of the pack, so you could find creative ways to attach things to it!I attached my two hiking poles to the large loops on the bottom and secured the with the adjustable loop that comes attached to the bag on the top. Super secure and snug!The bag was very comfortable to carry around and did not cause ANY chafing for the duration of 250k. No back issues etc.The only annoyance was the waist belt that you wrap around and buckle up to hold it secure to the body. There are multiple belts, one near the shoulder, one over the chest area and one on the waist. The belt that was attached to the waist snapped off on the very first day I was running with the weight and it provided no support in the bottom. The loop through which one end of the belt goes through came off and I tried to stitch it back a couple of times but it wouldn’t hold up.It’s a manufacturing defect and I would love to get a replacement but unfortunately I’m a few days outside the return window. That’s the only disappointment. If only that wasn’t there this would be a 5/5!!