I have a Maratac mid range bag and a contigo 32 oz water bottle. I'd like to be able to put a molle carrier on the end of this bag. Which one will work do you think? Draw string top will work fine, as will elastic top. Pictures for reference: The carrier would go where the large admin pouch is now and the admin pouch would move to the back side. I'm very interested to hear what you suggest as a water bottle carrier would really complete this load out for me.