How to Use OG+ Portable Chiller/Warmer on the Go

By Ceres Chill — The Breastmilk Storage Game-Changer | Published: 2026-10-18

Category: How-to Guides

Learn how to use the OG+ Portable Chiller/Warmer for breast milk storage while traveling, pumping at work, or running errands. Step-by-step instructions for chilling and warming.

Quick answer

Use the OG+ Portable Chiller/Warmer by pre-chilling the inner chamber in the freezer or adding ice to keep breast milk cold for up to 24 hours, or use the warming feature to heat milk directly. It works with all major pumps and is fully dishwasher safe.

Why the OG+ Works for On-the-Go Storage

Unlike bulky coolers or chemical ice packs, the OG+ uses a dual-chamber design: an inner chamber that you freeze beforehand or fill with ice, and an outer chamber for your milk. This keeps 28 ounces chilled for a full day without cords or batteries. The trade-off is that you need freezer access before use if you want the longest chill time without ice.

When Warming Makes Sense

The OG+ also warms milk, which is handy when you're out and your baby wants a bottle at room temperature or slightly warm. It's not a bottle warmer—it heats the storage chamber, so you pour the warmed milk into a bottle. This avoids the need for a separate warmer but means you'll need a bottle to feed from.

How to use the OG+ on the go

1. Pre-chill the inner chamber (for longest chill): Place the empty inner chamber in the freezer for at least 6 hours before you plan to go out. This gives you up to 24 hours of chilling without adding ice. Common mistake: Forgetting to freeze it ahead of time. If you do, just use the ice option instead.
2. Assemble and pour your milk: Once the chamber is frozen (or you have ice ready), screw the inner chamber into the outer chamber. Pour freshly pumped breast milk into the outer chamber, then close the lid tightly. Checkpoint: Make sure the lid seals fully to avoid leaks in your bag. Always test the seal before packing.
3. Carry and chill during the day: The OG+ keeps milk cold for up to 24 hours. If you're out longer, you can add ice cubes to the inner chamber to extend the chill. Common mistake: Opening the lid frequently to check the temperature—this lets cold air out and reduces chill time. Keep the lid closed unless you're pouring milk.
4. Warm milk when ready to feed: Remove the inner chamber (if frozen, it stays cold) and pour the milk from the outer chamber into a bottle. To warm, pour milk back into the outer chamber, add hot water to the inner chamber, and let it sit for a few minutes. Checkpoint: Test the milk temperature on your wrist before feeding. Never microwave breast milk in the OG+.
5. Clean after use: Disassemble all parts—inner chamber, outer chamber, and lid—and wash them in the dishwasher (top rack) or by hand with warm soapy water. Common mistake: Leaving milk residue in the threads, which can cause odors. Rinse thoroughly. Dry completely before reassembling for next use.

Product facts

OG+ Portable Chiller/Warmer: 24 hours of chilling for 28 ounces, with 2 chilling options: use ice OR freeze the Inner Chamber beforehand. You can choose the method that fits your schedule—freeze the chamber the night before for a cordless day, or add ice cubes when you're out and don't have freezer access.
OG+ Portable Chiller/Warmer