A circular water bottle can leak depending on the quality and construction of the bottle. The most important factor to consider is the type of seal used on the bottle. If the bottle has a screw-on lid, for example, it is likely to be more watertight than a bottle with a pop-top. Additionally, the material the bottle is made from can greatly affect its leak-resistance. Plastic bottles are not as reliable as stainless steel or aluminum bottles, as plastic can warp and bend over time, creating gaps in the seal.
The water bottle's design can also affect how leak-proof it is. If the bottle is made with a single-walled construction, it is more likely to leak than a bottle with a double-walled construction. Double-walled bottles have a second layer of insulation that helps to keep the water inside the bottle. Additionally, bottles with a wide mouth are more prone to leaking than bottles with a narrow mouth.
Finally, the quality of the bottle is important when it comes to preventing leaks. Cheaply-made bottles are more likely to leak than high-quality bottles, as they may not be as tightly sealed or well-constructed.
Overall, the answer to the question "Does a circular water bottle leak?" depends on the quality and construction of the bottle. High-quality bottles with a secure seal and a double-walled construction are less likely to leak than cheap, single-walled bottles with a loose fit.