For a while now, I have been using the Synapse 25 by Tom Bihn to carry all my sh…tuff. For about a week now, I have “downsized” to the 19 liters. Definitely one of the main changes, I am carrying less stuff, but only the most needed/used stuff! There was so much unused space with the 25 liters. The one weird thing is thatI was so used to the 25 that the 19 kind of feels like I’m carrying a fanny pack on my back (el-oh-el).