3ml Pen Cartridge Capsule with Screw-On Cap | ULTRAstack

Built for clean, safe cartridge storage.

The ULTRAstack 3ml Pen Cartridge Capsule is designed to keep standard 3ml pen cartridges protected, organised, and easy to store.

Designed and created by us, the capsule features a compact cylindrical body, a secure screw-on cap, and a textured outer shell for a practical, reliable feel. The precision-fit internal layout helps keep cartridges neatly in place, reducing loose storage and helping protect them from everyday knocks, dust, and handling.

Available in two storage options - choose the single-cartridge capsule for compact everyday storage, or the 3-cartridge capsule when you need extra capacity in the same clean ULTRAstack style.

Minimal. Discreet. Designed and built to keep things organised.

Key Features

• Designed to fit standard 3ml pen cartridges
• Available in 1-cartridge and 3-cartridge variants
• Secure screw-on cap for reliable closure
• Compact capsule-style storage design
• Bold outer shell with textured grip detail
• Helps protect cartridges from knocks, dust, and loose storage
• Minimal and discreet design
• Ideal for keeping research cartridges organised

What’s Included

• 1x ULTRAstack 3ml Pen Cartridge Capsule
  Please note: cartridges not included. For storage and organisation only.