BKR Water Bottles are made of glass and have a silicone covering. I find it to be the perfect water bottle and has a cap for ease of transportation. I prefer glass to any steel-insulated water bottle. Partially because it increases in temperature with the room so that you’re not shocking your body from the inside after warming up (even though it might feel good to have cold water in a hot yoga room). And just not a fan of the steel taste…it’s there…I know it.
Often times, I’ve kicked or knocked my water bottle over getting into Savasana and this one makes the least amount of noise vs. loud clanging from the steel water bottles.
Others that are yogi favorites: Swell, Hydroflask, Yeti
Miniso sells a great dupe of the BKR water bottle (not sure if it exists anymore).