Great bottle for practically all filtration systems. 28mm thread. Easy to clean from the other wide side. Super durable. The wide side works perfectly when drawing water. You can even make a camelbak with a filtration system on the line to the mouthpiece if you want. If you use it for dirty water, it can also serve as a washing machine on the trail when water is scarce. Put water inside a sock and shake the bottle in all directions for a wash—or rather a refresh. :-) Very professional and highly resistant equipment. Rinsing with baking soda removed the factory smell, and now it doesn't emit any odor. There are also ones with a 42mm thread, but then you need adapters for filters. I recommend it.
