United Scientific® Unistore™ - Sample Containers with Lids - Laboratory Grade Polypropylene Wide Mouth Reagent Bottle - 16 Oz Bottles with Caps (500ml), Plastic Bottles with Lids, Pack of 12

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.)

Super high quality heavy duty plastic storage containers. I am using them for liquid storage for my dosing pumps

I bought these to use for water bottles because they don't leech micro plastics. They can also handle very high dishwasher temperatures. I buy coozies for them. They're perfect for the beach. Lids never leak.

Nice and thick feel sturdy

Great product. Do not store chlorine bleach in these bottles. It will eat through the lid and leak. Otherwise they have worked perfectly for storing food, laundry detergent, all purpose bleach and many other things. Perfect for camping.

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!

what i needed

Was planning on using this container as an airtight container to pack human waste (poop) out during a packrafting trip. Tested for airtightness prior to trip and the seal works well.Accidentally dropped it off a 200ft cliff at the beginning on my trip...It survived bouncing down the rocks for the first 180ft, then cracked on the last bounce. Thankfully it was empty, as it was the start of the trip.I bought another when I got home from my trip. Next time I won't drop it off a huge cliff and I expect it will last an extremely long time.