We mainly sell drinking systems from the American Nathan. Some of them are easily adjustable and therefore "one size fits all." Some other products come in multiple sizes. Therefore, measure yourself carefully.
Size chart Nathan Running Backpacks
| Size | Chest circumference |
| XS | 83.8cm - 88.9cm |
| S | 91.4cm - 96.5cm |
| M | 99.1cm - 104cm |
| L | 107cm - 112cm |
| XL | 114cm - 119cm |
Size chart Reflective vest
| Size | Chest circumference |
| S/M | 61cm - 102cm |
| L/XL | 96.5cm - 114cm |
