I have a 17 oz. IronFlask bottle, and a 25 oz. BJPKPK bottle I purchased bumpers for--and well, these bumpers were hit and miss. The 17 oz. IronFlask bottle was too small for the light pink bumper I bought for it. I tried the fuchsia bumper, same problem. The bumper was so loose, it would fall off it I moved the 17 oz. bottle off the counter! The description for these bumpers needs to exclude 12 oz. and 17 oz. bottles, because even if you buy an IronFlask brand bottle--those bottle sizes WILL NOT FIT these bumpers! As for the 25 oz. BJPKPK bottle--I hadn't seen any reviews about these bumpers with a 25 oz. bottle--so here goes: It fit PERFECTLY! I was worried it wouldn't, because it said up to 24 oz.--but YES, if you have a 25 oz. bottle from another brand, these bumpers WILL fit! I will be returning the light pibk bumper and keeping the fuchsia one, but hopefully this review helps someone shopping for a bottle bumper! In the meantime, trying to see if I can find a smaller one that fits a 17 oz. bottle. Will update if I manage to find a smaller one on Amazon.??