To give a quick explanation, here are the main groups: SP Threads Not only are they not standardized, threads for 28mm threads can fall under the set 28mm group (Alcoa, Orbist or PCO) or under the size ranges (SP400/410/415). "ĭespite this apparently simple definition, things are not that simple: bottle threads are not standardized but follow more of a recommended guideline. It must be engineered to be cost-effective, to provide an effective seal (and barrier), to be compatible with the contents, to be easily opened by the consumer, often to be reclosable, and to comply with the product, package, and environmental laws and regulations. Either continuous threads or lugs are used. To take the Wikipedia definition (for a screw cap): " A screw closure is a mechanical device which is screwed on and off of a "finish" on a container. When talking about threads, we mean the screw-like lips on the neck of the container (in our case, the Vecto) that connects with a cap or a filter for a perfect seal to prevent leaking. The new Vectos have a stiff neck and a unique thread to allow a universal seal using mechanical torque. The 2nd generation Vectos that we are offering work with practically any kind of 28mm female thread: all the Sawyer filters, HydroBlu, LifeStraw, you can use any cap, hose connection or anything else that has a 28mm female thread. March 2019 update: Most of what is mentioned below relates to our 2018 Vectos as we kept adjusting the thread to fit a greater range of connections. So, to clear things up, maybe it is time to talk about those seemingly "simple" threads and add a little more info about the Vecto. We get so many questions about threads it seems funny that something so simple (from the looks of it) gets so much attention, but it does.
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