Portable Chargers are very compact ,they are not only for portable charging but also around the home making it a favorite for travel.You could benefit
Portable-Charger-Power-Bank - 2 Pack 15000mAh Dual USB Power Bank Output 5V3.1A Fast Charging Portable Charger Compatible with Smartphones and All USB
Zone One 15,000mAh Dual-USB Power Bank (Blue/2-Pack)
APOLLO 18 POWER BANK 8000mAh
Odeon Slim Power Bank - 4,000mAh
Zone One (4) - Crown Sales USA
Power Bank 15,000mAh Double USB and Type C Black
15000mah Power Banks
RAVPower Portable Charger 15000mAh Power Bank Battery Pack
Advertising Dar Issue Nº 990 - 17th August 2018 by Advertising Dar - Issuu
RAVPower 140W Portable Laptop Charger, 27000mAh Power Bank with 2 USB
Power Bank 15,000mAh Double USB and Type C Black