Osprey makes comfortable, durable packs. You’re going to pay a bit more but you’ll get all the bells and whistles. Literally mine has a plastic clip on the chest that is also a whistle. There’s also clip inside to secure your car keys. I don’t use it but it there’s a pouch to hold a water bladder and an opening to can attach a tube that dangles by your mouth.

An outdoor outfitter like REI can help you pick out a pack that’s suitable for what you’ll use it for. Some are customizable, they can set it up for you. This is particularly important if you are looking at larger packs that carry a lot of weight