What are you confused about?
Buy a water bottle bag that is suitable for outdoor but can accommodate mobile phones and personal items, or look for a bottle carrying bag to protect the Stanford water cup you are using?
All solutions here as below.
--CTSZOOM Water Bottle Carrier Bag is fit Stanley 40 OZ Quencher H2.0 and Adventure，also fit a wide range of popular brands and models 40 OZ water bottles.
