United ScientificUnistore™ - Sample Container with Lid - Laboratory Grade Polypropylene Wide Mouth Reagent Bottle - 135oz Container with Lid (4000ml), Plastic Bottles with Lids, Pack of 1

Note: this bottle is made of food-grade plastic. The product info on Amazon doesn't mention it, but you can find a statement saying so on the company's website. I use it for mixing and storing meal replacement drinks, and it seems to work well so far.Comparing this (4L polypropylene bottle) to a Nalgene brand 2L high-density polyethylene bottle I own, it find the material to be sturdier / more rigid, which could be a good or a bad thing. It's not as smoothly machined as the Nalgene bottle - you can easily see and even feel the seams in the plastic where edges of plastic sheets were joined together.The Nalgene bottle's cap is a single piece of plastic that screws on with a snug fit, whereas this bottle's cap is not as perfectly fitted and comes with a rubber ring inside to ensure it seals properly. The rubber ring needs to be removed and washed separately, which is an extra hassle compared to the Nalgene bottle. Perhaps it's inevitable due to the materials, though; it may be that this bottle's rigidity makes it harder to get a good seal without a rubber ring, whereas the Nalgene bottle is more pliable, allowing its cap to "bite into" the lip a bit.The rigidity also means that if the pressure in the bottle changes (e.g. if you put in a hot liquid, close it, and let it cool), it can be difficult to wrestle the cap open again, so watch out for that.Other reviewers have mentioned this, but the bottle doesn't come with any "United Scientific" branding on it. Instead, it has "PolyLab" and "4000mL" embossed on the bottom. I don't think that means it's counterfeit - if you look up import records, PolyLab appears to be an Indian company that serves as a supplier / manufacturer for United Scientific, so I wouldn't be too worried.Other than those points, I'm generally pretty happy with this bottle. It's twice as large as my Nalgene 2L bottle but costs significantly less, and works about as well for my purposes. (Actually better, thanks to the size.)

Good quality bottle. I'm using it to keep diesel fuel treatment treatment in. So far, no leaks.

Holy Wow Super AwesomeThese are just gosh-darn-great bottles. They are the size and shape of Nalgene's but feel heavier and a lot more solid. They feel good in your hand -I can assume these bottles are polypropylene instead of the polycarbonate that the Nalgene's are --they are just, I dunno, "softer" in your hand, not the brittle feel of the polycarb. The lids are great -good feel, good seal, not jammed into place when trying to unscrew them later. I guess the only gripe I could have is that it would be nice to have volume marks ("graduations"?) on the side. Then again, that's probably why God gave me a Sharpie and (not quite) rudimentary math skills.So yeah, these bottles are double-plus-good. If you figure in that they are less that 2 1/2 bucks and like, 1/3 the cost of Nalgene, they are double rainbows, the cat's meow, sliced bread and the corner-piece brownie.I have spoken,May the Force be with you,Sincerely, Topher!'Ting!

Nice and thick feel sturdy

Works well with preservative oil. As advertised. I wish there was an option for less quantity to purchase would be my only complaint

Great bottle, great price. It seems to be very durable and leak proof but it does also really latch on to the fragrance of whatever is stored inside so heads up on that

Perfect for my needs.

We bought a lot of these bottles to store our seeds in and so far we love them! We added moisture absorbers to the bottles to protect the seeds for extended storage. Will buy more!