It can fit around 22 packets of 36mm width each (height doesn't matter).

External size: 132.8 mm x 45.2 mm x 47 mm (height). 

Print recommendations:

• 15% infill
• 0,2 mm layer
• no suports

Original model created using onshape, and you can find it here and change as needed:

https://cad.onshape.com/documents/a19ffa45f0f787210cf27da5/w/a339ac9d6efb58d1c2713dbe/e/236d36b8f7a3011822a6f85c