Are all the ryot line of pipe bags smell proof?

Ryot offers 2 types of bags.

Smell Proof
RYOT Smell Proof bags offer the highest level of odor containment and weather proof protection. The exterior shell design shuts with no air escaping. No air escaping means no odors escaping. The RYOT SmellSafe Carbon Series technology neutralizes and trap odors, therefore, reducing the amount of odors released when bags are opened. Pack and Protect with RYOT.

Smell Safe
The SmellSafe Carbon Series incorporates extensive carbon permeated padding, therefore, neutralizing and trapping most odors in its pores. Additionally, our coated weather-proof fabric and moisture seal zipper provide a true physical barrier to keep most odors in and the weather out. The RYOT line of pipe and vape cases is for the discerning herbal enthusiast. We value utility, discretion and style. Pack and Protect with RYOT.

When glass artist sign their work. What medium or metal is being used

The most common is a Titanium pen.  Any titanium works, but there is a trick!  The glass must be wet, so the blower usually gives the pipe a tongue kiss, then signs.

Or sometimes as Steve K did, he signs a paper and had that turned into a platinum decal.  That can then be applied to the glass.

What is S Tier? And what do we use it for?

This is a new type of insert for your banger.  It is made from Aluminum Nitride.  We feel this is all about hype and a quartz insert will do you fine.  More so, we find using an E-Banger like the SSV is the ultimate way to go for connoisseurs.