CHASE F Yes. It is a very comfortable for both.

ERIC S I don't see why it would not be good for hot weather. I would think the insulated tube would keep the water cooler for you. I also would not think it would be any hotter to wear than any other backback.

Craig S No reason it wouldn't be just as useful in warm weather. If anything, I'd think the insulated hose would help keep your liquid a bit cooler than one that's not insulated. The bladder itself isn't any different than a warm weather pack.

RUSSELL R I use mine in all weather. In hot weather I believe it keeps the water colder longer.

MICHAEL M Yes. It is insulated very well.

Craig S To add, the sternum strap is adjustable. It can be shortened/lengthened and it also slides up and down the shoulder harnesses to find a comfortable position. One side of the strap has an elastic band with a longer nylon strap to give it some flex with your movement. The nylon piece stops the elastic from over-stretching. All in all, I thought the sternum strap was one of the best designed aspects of this pack.

UY P Yes it does. It's a great pack. I was going to go with the zoid but this one has more room to put your keys and power bars. Enjoy

BRIANNA B It does have one. If you are a petite person, the strap doesn't tighten as much as you might like, but for someone with broader shoulders, this would fit snugly.

ERIC S Yes it has a sternum strap.