The bottles are great. It is a good glass material that does not leach out. I dropped one of these a few times and it didn't break like I thought it would. may be. The lids can be a little problematic, but they provide a solid seal and I haven't seen any signs of leakage. My only concern is the quality of the seal between the o-rings and the lid, as I've found lids have issues with the o-ring staying in place. They haven't fallen out yet, but on some bottles they fit perfectly on the cap, on others they are misaligned. Remember, these bottles sit in the fridge 99% of the time, except when I'm drinking from them or topping up with water. If they don't fall out I'm sure of my 5 star rating but if they did fall out I would give them a 4 star rating. I would still highly recommend them as they were very valuable.
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