Big Joe Stomp Box Co PB-109 Lithium Box LI2.
This amazing little box is only 3.25" x 1.625" X 1.25 and weight a mere 3.8oz. Yet it is able to power up to eight power hungry pedals for a up to eight hours on a charge. Yes I said a charge, no Ac power required and the best thing is there is 60 cycle buzz. Thats because it is a Dc power not an Ac power supply. The total output of this amazing power supply is 1000MA at 9 volts . The PB-109 charges via the supplied USB cable and the Big Joe USB power cube plugged into any wall outlet.  You can also charge the PB-109 via and car or computer USB outlet. 

Some of the best features of the PB-109 is the ability to check the remaining battery life, current power draw and the approximate percentage of battery life.  When the PB109 get down to approximately 20 minutes left the % decimal led will begin to flash rapidly. So if your sick of AC noise in your rig or simple don't want to deal with finding ac power. Then you need a Big Joe Stomp Box Co PB-109 Li2. 

On a side note you can power any devise that requires 9 volts of DC power from the PB-109. Just as long as it wont exceed a 1000mA draw. 

What"s included
1) Power box Li2
1) USB type C charging cable
2) 5.5mm x 2.1mm male /male pedal connector cables
1) 8- output daisy chain cable 5.5mm x 2.1 mm male /male cable
1) USB power block
1) User manual