Velcro pump paks are easy to open and close. Sealed with a Velcro closer. Standard size pump paks (holds all insulin pumps except the disetronic d-tron & the d-tron plus) Pump Paks for everyone! A great way to carry your pump. Comfortable, fun and durable. Choose from a variety of styles and designs. Pump cases with themes and designs, this gymnastics go for the gold is a real winner