This Activated Carbon Filtering 400ml/580ml Water Bottle drops from $4.69 to $3.99 at Mini In The Box. Plus, shipping is free. This ties with our mention from last month and is a current price low by $4. Choose between a 400ml or 580ml size bottle at this price, which includes a filter. A color will be chosen at random from the six colors pictured. Note: un-check the "shipping insurance" box at checkout, otherwise it adds an extra $0.99. There is no sales tax.