When you remove the straw does the hole autoseal? I have to store this on its side in the fridge and need to know if the contents will drip. Thanks.

No. It comes with 2 tops- a straw top & flip top. The straw top is NOT leak proof — you cant store on its side with the straw top. The flip top might be ok, but I would not trust it not to leak loose in a bag or on its side. At this price, there are far better options if you are looking for leak proof.

does flip lid lay flat when open

Yes, the lid lays flat and when closed if it tips over no spillage

According to the manufacturer: 16oz - 6.4 inches 20oz - 7.6 inches 24oz - 8.7 inches 28oz - 9.8 inches

Does it leak all with the straw if it gets turned over in my bag? Thank you

Lots of fake reviews here and answers that seem to reference another product (at best), or are also fakes. Be on guard. Yes, it will definitely leak with the straw top if you throw it in a bag. *maybe* it wont leak much if its in a sturdy water bottle side pocket on a backpack and you don’t jump around too much.