I know that there are already threads going on what bag to bring to the parks - or whether to bring one at all. My particular question is for those of you who do choose to bring water bottles (mine are 16-20 oz insulated metal hydroflask type) what type of bag or water bottle sling do you use? I've carried an Eddie Bauer backpack for years but the water bottle pockets on the side have gotten stretched out and my bottle kept falling out during my last WDW trip so I guess it's time for a new bag. I don't bring a ton of stuff into the parks and often that can fit into my and my husband's cargo pockets. However, I'd prefer to bring my own water bottle and not keep wasting paper cups from QS if I don't need to. I'm open to bottle slings, small lightweight backpacks, sling packs, fanny packs, etc - anything that you've already used and carried water bottles successfully.