Every year somebody asks why Towne Club and Frostie are still in 16 oz glass when the rest of the category moved to PET two decades ago. It is a fair question. Glass is heavier, more fragile, and more expensive at almost every point in the chain. A pallet of glass carries less product than a pallet of plastic and costs more to freight. Breakage is a real line item.
We keep running it for three reasons, only one of which is nostalgia.
Glass does not participate in the flavor
This is the part people assume is marketing and it is not. PET is mildly permeable to gas. Over a long enough shelf life, carbon dioxide migrates out of the bottle and oxygen migrates in. The soda goes flatter and the flavor oxidizes, and both effects accelerate with heat. A PET bottle sitting in a warm warehouse in August is on a clock that a glass bottle is not.
Glass is inert and effectively impermeable. What you sealed in is what the customer opens. For a cane sugar formulation with delicate fruit character — Michigan Cherry is the obvious case — that difference is tasteable at four months. For a cola it matters less. For a root beer with a long vanilla and wintergreen tail, it matters a lot.
Thermal mass changes the drinking experience
A glass bottle out of a cold box stays cold noticeably longer than plastic, because glass carries more thermal mass and dumps it more slowly into the drink. Nobody writes this on the label, but it is a large part of why a glass-bottled soda "tastes better" to people who cannot articulate why. They are drinking it colder for longer.
Carbonation perception is tied to temperature too. Warmer soda releases CO2 faster and reads as both flatter and sweeter. Keeping the liquid cold keeps the carbonation tight and the sugar in balance.
It is a capability most co-packers gave up
Here is the commercial reason. Over the last twenty years, a lot of contract packers dropped glass entirely. The lines are harder to run, changeovers take longer, and the breakage tolerance is unforgiving. It made sense for plants chasing high-volume single-SKU work.
We did not drop it, because glass is core to our own brands. That left us with a capability that is now comparatively scarce. When a craft soda brand needs a few thousand cases in glass and cannot find anyone willing to quote it, we are a short list.
Capability you maintain for your own product becomes a service you can sell. That is most of the argument for vertical integration in one sentence.
What glass actually costs you
If you are weighing formats for a new product, the honest tradeoffs:
- Unit cost. Glass is meaningfully more expensive per container, and the gap widens at low volumes where you cannot buy bottles efficiently.
- Freight. You are paying to move weight that is not product. On long-haul distribution this dominates.
- Breakage. Budget for it in production, in the warehouse, and in transit. It never goes to zero.
- Shelf placement. Some retailers restrict glass in certain sections. Ask before you commit.
- Perceived value. Glass supports a higher price point. In craft and nostalgia categories it is close to mandatory.
The calculus flips depending on where you are selling. For a regional brand with a premium position and short freight lanes, glass is often correct. For a value product shipping nationally, it rarely is.
The Michigan wrinkle
Michigan's ten-cent deposit applies to both, so the container return infrastructure is not the deciding factor here that it might be elsewhere. What it does mean is that Michigan consumers handle empties as a matter of routine, and glass returns in better shape than crushed plastic. It is a small thing that makes the format feel less disposable in this market than it does in others.
Towne Club sold by the wooden case for a reason. People brought the bottles back. The deposit system is a distant descendant of that habit, and it is part of why glass still feels native here.
The short version
We run glass because it protects flavor, because it drinks better cold, and because staying good at it turned into a service other brands need. If you are choosing a format, do not pick glass because it looks nice in a photograph. Pick it because your product's shelf life, price point, and freight lanes actually support it — and then be honest with yourself about breakage.
If you want to talk through which format fits your product, that conversation is free and usually takes about ten minutes.