Thanks gals!
this is what I did last evening: I added 3 rows of seed stitch to the bottom on one side, intending to do the same on other. I am also thinking that maybe two buttonholes might work in one of these sides. Then I can just button it closed. I don't like snaps nor velcro, and I have many large buttons.
By the way, a full hot water bottle is now inside this knitted cover...
Closeup of that bottom: (looks raggy doesn't it?...haven't blocked it at all, yet. Will do. Then I will show you the final outcome.
Gosh this has been a long project! Thank you for your patience with me, knitters. I'm now 64 years old and likely won't get much better at knitting, and I drool over the lovely things others do...but I still love to knit! (and lumpy things look so cozy, don't they?) hehe
I can see from this photo that my cables are holey at the edges...hoping some blocking might disguise this. This is acrylic yarn though, so not likely to change much.