The Stanless Wide Flip D-Ring cap comes with a loop that can either be left down to make it more space efficient, or it can be put up so that it can be clipped to things like rucksacks and bikes. The cap is made from polypropylene, and is quite durable.
The interior of the cap is made from food grade stainless steel, and is dishwasher safe. This cap can be put on any of the wide and insulated bottles.
The cap is leakproof, and also has no toxins or BPA that could be harmful to you.