On-The-Go Bottle Warmer Instant heat with the snap of a button. Remains warm for hours and can be used again and again! The zippered holder accommodates most baby bottle sizes-reusable or disposable. Velcro strap attaches easily to strollers, diaper bags and more. To re-energize warmer pouch, simply place in boiling water until all the crystals have dissolved. Completely non-toxic. No batteries or electrical supply needed.