Drankful makes size exchanges quick and easy. Once you receive your pack, try it on to see how it fits. If you’d like a different size, we can do an exchange just as long as the following conditions are met. - It's in brand new condition (never been worn for any type of exercise/activity yet) - All the original tags are still on it - It's within 30 days from the date of delivery If all 3 conditions are met, please email hello@drankful.com and we’ll be happy to begin the exchange process.