3 zippers with one exterior cell phone pocket.  12" inner zippered pocket for tablet or laptop computer.
Dimensions:  18 in wide by 13 and 1/2 tall with a 4 inch wide rectangular base
Materials:  linen and cotton with quilted and appliqued exterior.  
 
Comment:  this bag was inspired by the bike!  Mike and I got electric assist bicycles a couple of years ago and we love riding up and down the northwest hills on those bikes!