I'm enjoying the smaller glass bottle and the waterdrop tablets. It's an easy way for me to get more water into my daily routine. I'd much rather drink from glass than metal or plastic. The bottle is pretty, too, and the cap seems leakproof. The starter kit is a great way to go as you get everything you need to begin with this product. The backpack is small, though, and can get heavy with a glass water bottle filled up. I haven't used the backpack at all, as yet, and usually, just place the bottle in the cup holder in my car or in my cooler backpack. I like the water tablets, and I like that there are various vitamins and minerals included. There is no sugar - but it does use artificial sweeteners such as stevia so if you're not used to that taste you might not like them. And the only reason I gave this 4 stars is simply that the colors on the bottle are not as bright as they appear on the website. The colors are much duller. There's also a bigger bottle, which I had ordered by accident (I thought it was a smaller bottle) that I find I mostly keep in the refrigerator as it's a bit too big and heavy to simply carry with me.