A pretty simple hot water bottle cover in chunky-weight yarn.

Also included are the rough numbers for an Aran-weight yarn (untested).

Now available as a Ravelry download.

Note: the “collar” portion is a snug fit on purpose. This was done with safety in mind, to prevent the bottle accidentally falling out or to prevent it being pulled out by vulnerable people.

Note 2: Version 3 is the current pattern. A small correction was made for the stitch count of the collar (Read: 20 sts should have been 10 sts].