VULSINI Hot Stone Heating Bag

This is my second purchase from Vulsini. The first one was several years ago, directly from the manufacturer in Europe. The first one bought a few years ago gets up to temperature better. I really like these bags, but they do take a long time to get up to temperature, especially if you have it full of your items. I allow three hours for that.Suggestions for improvements: 1. Make the controller so you are able to put it on a timer and have it start up at the designated time. 2. Make dividers that fit into this case to separate the items. I purchased plastic dividers to stand my stones on edge to fit more in the case. (That is also the reason the stones take longer to heat.)Otherwise, these are my go-to heating bags.