The OlovesM double hiker is honestly the best! I made it for myself, since I love to hike- you can see in the picture below. With an adjustable waist belt, a sturdy buckle, so it wont fall off.
2 zipper compartments to hold pretty much everything you will need. There is the open compartment at the top, and it will hold 2 water bottles, or else you can put a jacket or shirt in the space and water bottle, etc. It also opens up on the sides, to cinch up a jacket or shirt, you can see in the photo.
I have hiked Aspen Mountain with this, day hikes, even use it when I bike ride with my kids. this fanny pack is more then your basic fanny pack, so I call it the Double Hiker!
Handmade in Colorado, USA made fabrics and yoga mat for the main body of the hiker.