Texture or Pattern on the Surface of a Long hwb is Essentially Irrelevant
Product description: Explore our collection of long hot water bottles, each sold with a matching cover. The surface texture of the bottle is not important—every set comes with a soft, practical cover for safe, comfortable
The texture or pattern on the surface of a long Hot water bottle is essentially irrelevant because they are always sold with a cover.
Reason:
Long hot water bottles (the rubber/plastic containers) are almost never used directly against the skin or bed because they can be too hot or uncomfortable.
Therefore, manufacturers always bundle them with a soft, fabric cover at the point of sale.
Since the cover encases the entire bottle, the bottle's own surface design is completely hidden and not felt during use.
The cover's material and appearance are what matter for comfort, safety, and aesthetics. The bottle underneath only needs to function well (hold hot water safely).
In short: The bottle's texture doesn't matter because you only interact with the cover.