This project is going through but I haven't finalized the plans. I figured I'd post for feedback before I start buying the metal parts. I store my rifles in pelican cases. I have a bunch of smaller desiccant packs but they are small, inconveniently shaped and sometimes they are hard to tell if they changed color. My favorite right now is the Dry Packs as it's super easy to inspect the color but at 45 grams it's small. So far I own this: Dry Packs Loose / Bulk Silica Gel Orange Indicating Desiccant - 4.5 LBS And I'm thinking about buying this: Round Steel Tube 4 FT $23.88 1-1/2 OD x .065 wall x 1.370 ID 1020 DOM Steel Sheet $11.74 16 GA. (.060 thick) And I will cut the tubing into 7" lengths to match my SilencerCo Saker. This is a convenient shape for me. I can pull out the dry pack and put in a suppressor. Plus it's big. Another possible shape is a 2-3" deep hockey puck as there's always some corner you can put that in. Not sure how to cheaply fabricate that kind of shape though. I can weld the sheet steel to the end of the tubing but not sure whats the best way to perforate the metal. Lots of little holes (tough to do in regular fashion) or cut big holes or slots and put steel mesh inside. Big holes or slots will aid in visual inspection. Cutting 1/8" x 2" slots that are perfectly and evenly spaced on a tube may be a bit tricky as well. But I can try.