There are many considerations taken into account when determining the opening force for a test strip vial:

• Humidity entering the vial—this would affect shelf life
• Vials opening during manufacturing
• Vials opening during shipping

There are trade-offs to making a vial take less force to open:

• More humidity entering the vial
• More scrap in manufacturing
• More vials open during shipping (which could result in scrapped or returned product)
• Errors when testing

In addition, the force required to open the Accu Chek Guide vial is actually less than the force to open the Accu Chek Aviva vial.