How to Use the Inner Chamber Handle Sleeve for Easy Carrying
By Ceres Chill — The Breastmilk Storage Game-Changer | Published: 2026-10-22
Category: How-to Guides
Learn how to attach and use the Ceres Chill Inner Chamber Handle Sleeve to turn your breast milk cooler into a sippy cup or baby bottle your little one can hold easily.
Quick answer
Attach the Inner Chamber Handle Sleeve by sliding it onto your clean, dry 6oz or 12oz Inner Chamber until it sits snugly at the base. The silicone grip gives your baby a secure hold when using the chamber as a sippy cup or bottle.
Why use the handle sleeve?
The Inner Chamber Handle Sleeve transforms the smooth stainless steel chamber into a textured, easy-to-grip surface. This is especially helpful when your baby is learning to hold their own cup or bottle — the sleeve prevents slipping and makes the chamber feel more like a familiar sippy cup.
Which Inner Chamber sizes fit?
The sleeve fits both the 6oz and 12oz Inner Chambers. It does not fit the 4oz chamber or the OG Chiller outer vessel. If you own the 4oz chamber, you will need to upgrade to a larger size to use this accessory.
Step-by-step: Attaching the handle sleeve
- Clean and dry the Inner Chamber: Wash and thoroughly dry your 6oz or 12oz Inner Chamber. The sleeve slides on best when the chamber is completely dry — moisture can make the silicone stick and bunch up. A dry chamber prevents the sleeve from sticking prematurely.
- Align the sleeve opening with the chamber base: Hold the sleeve with the wider opening facing the bottom of the chamber. The sleeve is designed to slide from the base upward — trying to attach it from the top will be much harder and may damage the silicone. Always start from the bottom, not the rim.
- Push the sleeve up to the desired position: Gently work the sleeve upward using both thumbs, pressing evenly around the circumference. Stop when the sleeve sits snugly at the base of the chamber, just below where the lid or nipple ring threads on. Do not pull or stretch the sleeve too far — it should fit comfortably without gaps. If the sleeve feels loose, push it slightly higher until it grips firmly.
- Check that the sleeve is secure: Give the sleeve a gentle tug to confirm it does not slide off. If it moves, reposition it higher up the chamber wall. Once secure, fill the chamber with milk or water, attach the lid or nipple, and let your baby hold it. Test the grip before each use, especially after washing.
Product details
- Inner Chamber Handle Sleeve: An epic silicone sleeve to help your little one easily hold the Inner Chamber when you're using it as a sippy cup or baby bottle. This sleeve will fit on your 12oz and 6oz Inner Chamber. The soft silicone adds grip and comfort, making it easier for small hands to hold the chamber without dropping it.
Inner Chamber Handle Sleeve
