This is the latest model, V4.

To attach the box to a backpack, you need the V4 lid-belt.
There are different body models:

• V4 body-original: Simple design with a slot for a rope
• V4 Body 100: For longer cigarettes
• V4 body-screw: For extra attachments
  • V4 ring bottom-screw: Covers the threads
  • V4 bottom-screw: Holds cigarette butts; don't throw them in the wild!
  • V4 XL bottom-screw: Larger, can hold cash for a beer.

Print this without support and with varying layer heights to keep the threads precise. I use a layer height of around 0.1mm on the threads.

V4 is an improvement over V3 because it features: (link to V3)

• Better threads with less than one turn to open
• Holds 6 cigarettes instead of 5
• Includes an extra container for cigarette butts
• A lid with a hook for attaching to your pack