I bought this backpack after having used a high sierra hiking backpack from Costco for years. It wasn't until I went into REI to get properly measured that I'd realized I was using an improperly fitted backpack and found this. The Osprey tempest is a women's cut hiking backpack. I never realized how well a properly fitted pack would be until I got this. For reference I am 5'2" with a torso length of 14 inches so I bought the XS size. The backpack is very comfy and lightweight. It's easy to adjust the straps to fit snugly against my body. I will say I have always loved Osprey. They make really high quality backpacks and are backed by warranty in case there's issues. To be fair though, my other Osprey I've had for YEARS and never felt the need to contact them for problems. The backpack does have a waist strap with pockets which kind of fit my Samsung S21 but honestly it barely fits in there. It's more of a struggle tj try to tuck it in there but it's doable. The bladder pocket as many others have noted is tight, but it's not necessarily unusable. I was able to fit a 2L Hydrapak bladder in with some effort. I think you're best bet would be to put the bladder in first before you start packing your bag. There's a nice helmet lock on the outside of the pack which frankly I don't use much except to attach my hat if I bring one hiking. All in all I would say this backpack is fantastic if you want a light, small backpack for a day hike. It's not meant for backpacking as the XS is only 18L but it will definitely fit all your essentials.