I like keeping these kinds of large water bottles/jugs around, and keep them on rotation (while a couple are cooling in the fridge, I'm actively working on another.) These are overall pretty decent quality with one rather significant design flaw that affects performance. The tube or "straw" that runs from the lid into the bottle runs very nearly to the bottom of the container, with only maybe a millimeter between the end of the straw and the bottom. Basic physics says when you start to impede the flow of a liquid, you build a high pressure differential. To dispense with all the science mumbo-jumbo, it's hard to suck things out of these bottles. I got two with a recent order, and had the same problem with both.At first I thought the hole in the lid just under the mouthpiece which draws in air from outside when you suck was too narrow. But that didn't seem to make as much difference when I carefully widened that hole. It then occurred to me to check the length of the straw. Sure enough, it was practically sitting on the bottom of the bottle.What I did was very carefully took a sharp blade and cut a small (2-3mm) "wedge" from one side of the bottom end of the straw. It's a fairly narrow cut, only about 15° or so, but it was sufficient. I put it back together and tried it out, and voila! That did it! A huge and noticeable improvement over the original. I tried the two side-by-side, and there was definitely a difference in performance. I did the same modification to the second bottle's straw, and they both work so much better now.My advice to the manufacturer of this product: either cut the straw's length about 2mm shorter than you currently are, or consider cutting the bottom end at an angle to prevent this issue. It's otherwise a good product, and this issue and the rather dodgy latch on the flip-lid kept it from being a 5-star review. I haven't tried a home fix on the lid yet, although I suspect some very careful minor filing of the two "teeth" that catch the latch might do the trick.