This is a nice and small water filter straw. It is only a few inches tall, so it is easily transportable. I found the directions that came with this quite confusing and very unclear. I found it easier to look at the pictures to figure out what they were talking about than reading the directions. I am pretty sure I figured it out. I think with a product like this, clear directions should be given. I received this item at a slight discount for my honest and unbiased review.