Review title is So handy to have [SEP] The small bottles that come with the sleeves are easily removed to be filled. They are simple to fill from a larger bottle that has a pump. For other types of bottles, you can use a funnel. The bottles don’t leak as long as they are securely closed after use. The inner bottle is protected from breakage by the sleeve. I like that there are options for the colors of sleeves.<br /><br />Each bottle has a small carabiner clip that can be used to attach it to a bag or belt loop.