The Warmze technique to keep baby bottles warm is fantastic. It’s easy and requires no electricity or battery power.

Portable Bottle Warmer

Warmze | warmze.com |$14.99
I can’t tell you how many times I was out with my little baby and needed to warm a bottle. I would find the nearest restroom and run hot water around it until it was warm enough. That took FOREVER! Needless to say, this little item would have saved me some time and … some weird stares. LOL. This large starter kit includes a patterned sock and two biodegradable warmer refills to make heating Baby’s bottle easy when you’re on-the-go. Simply wrap the warmer — think “hand warmer” — around the bottle, fit the snug sock around it and the warming begins. The cover is available in a variety of patterns and in a few different sizes, too.