US$ 23.25
bike helmet for 8 year old Kids Skateboard by OutdoorMaster or skating Pañalera Size:Xs/S Herschel Retreat Small Backpack
Herschel Retreat Small Backpack Premium Classic - Metal / OS
It protects the battery well, features an integrated spring rack and works with some bags and panniers but not all
Pañalera
Size:Xs/S
And if you aren't in peal physical condition or like carrying 50 lbs on your back then seriously consider building a rolling bug out bag
or skating