Mason Bottle Mason Jar Bottle System
Silicone is a primary contact surface here — your food is in direct contact with it, not just a seal.
Turns a regular-mouth glass mason jar into a bottle or sippy - liquid only ever touches glass, steel, and silicone.
The verdict: Silicone only
A stainless steel band clamps a silicone nipple, sippy spout, or straw top onto a standard regular-mouth glass mason jar. The brand's whole pitch is that liquid only contacts glass, stainless steel, or silicone - no plastic in the path. The band is 304 food-grade steel and the tops are medical-grade silicone, so this is a clean silicone-only across both the infant-bottle and sippy stages. (There's also an all-silicone squeeze bottle variant - still silicone-only.)
Verification: Manufacturer confirmed
What it's made of
| Part | Material | Food contact |
|---|---|---|
| jar body standard regular-mouth mason jar (Ball/Kerr-type soda-lime glass); glass is the vessel | Soda-Lime Glass | Yes primary |
| band / ring 304 food-grade stainless steel band clamps the top on - steel, not plastic | Stainless Steel 304 / 18-8 | Yes primary |
| nipple (infant variant) medical-grade silicone dual-vented (FussFree) nipple | Silicone | Yes primary |
| sippy spout (variant) silicone sippy/drink top that fits the same band and jar | Silicone | Yes primary |
| straw top (variant) silicone straw top option | Silicone | Yes primary |
| protective boot / sleeve optional silicone boot for grip and drop protection | Silicone | No |
A conversion system rather than a single bottle: a 304 stainless steel band and a silicone top (nipple, sippy spout, or straw) fit any standard regular-mouth glass mason jar, turning a jar you may already own into a baby bottle and then a sippy cup. Made in the USA. The brand also sells an all-silicone squeeze bottle for the same purpose.
Pros
- Steel band instead of a plastic collar; grows from bottle to sippy to straw cup
- Uses cheap, replaceable, universally available mason jars
- Interchangeable tops cover both the infant-bottle and sippy stages
Cons
- Mason jars are heavy and breakable (a silicone boot helps)
- Wide jar mouth is bulkier than a purpose-built bottle
- Still silicone (not natural rubber), so not for zero-silicone purists
- You supply/replace the jars yourself
Notes
- Tops are interchangeable on one band/jar: infant nipple, sippy spout, straw - hence both categories
- An all-silicone squeeze bottle variant also exists (still silicone-only); the glass+steel system is the flagship
- Fits standard regular-mouth mason jars only (not wide-mouth)
Categories: Baby Bottles · Sippy Cups & Toddler Cups
Sources
Every material claim above is backed by these. This is the scattered info we centralized.
- manufacturer https://masonbottle.com/ brand states liquid and food only come in contact with glass, stainless steel, or silicone
- manufacturer https://www.amazon.com/Mason-Bottle-Silicone-Nipples-Two-Pack/dp/B01I2TOSS0 nipples are pure medical-grade silicone, BPA-free; bands are 304 food-grade stainless steel
- review https://thebluebonnetfarmhouse.com/the-best-healthy-baby-bottle-and-sippy-cup/ independent review of the glass mason bottle used as both bottle and sippy cup
Spot a mistake or something out of date? Let us know — corrections are how this stays accurate.