Since the Bogg Bag people don't want to make dividers for the bitty version, I had to make my own. I hope this helps some other people who just want to put their water bottle in a separate space. :) I mostly use my bag for a "house purse" to tote around my water, tablet, phone, etc. There are two plates, one is a divider that is all one width. The second one is tapered so when the bag flexes, the divider is more stable. I occasionally had the straight one pop out--not often, but enough to make the second version.