Very Convenient
I purchased the double travel size pack, figuring they could be refilled.  The cost is a bit more this way, but I think it's worth it and is still a reasonable value.  I keep one bottle in my car, and one on my desk.  There is a cleaning cloth for each, and I recommend hand washing the cloths before using (hang to dry). They will be much softer and easier to use. There is also a travel container for each, so no worry about spills in the car, handbag, or glove compartment.  I do wish the cloths were a bit larger though, as I like to hold my glasses along with the cloth, and clean both lenses at the same time, which I can do, but would find easier with a tad bit larger cloth.  All in all, a fine eyeglass cleaner.
Rating: 5 stars