The Sally Bag holds up to a 40oz Hydroflask as well as a pocket for your phone/wallet and an optional clip to hold your keys. This bag is perfect for hikes, trips to the gym, or any occasion where you find yourself in need of an extra pocket. If you have a looser tension or want your Sally Bag to fit snug around your bottle, I recommend using a 4.5mm instead of a 5mm. Enjoy and don’t forget to tag me on Instagram @KnotsByKari with your finished bag <3