Review (4/5): Good, but wouldn't use for canning/preserving
They are solid bottles, I used them to bottle a batch of hot sauce I made with superhot peppers (ghost, scorpion, reaper) where I didn't really have enough to use my normal 5 oz bottles. They have this odd seal that is built into the cap and because of the narrow opening I don't know that the hot-fill and invert method would be sufficient to sterilize them. They are also kind of difficult to fill due to the narrow bottleneck.