Personally I don't recommend lipo charging bags...

For one, they don't work (check YouTube)
and two, u can't see the battery so if its puffing up u would have no idea.

Well ill lipo's and chargers depend on ur needs and how deep ur pockets are.

cheap option.... Standard any brand 2s 5000mah lipo 25c with 1c charge rate with a cheap 5a charger will see batteries charged in under 80min,, something like zippy or turnigy lipo and a IMAX ACB6 charger should total around $50-$60

Or..... U could look for a battery that can be charged at a much faster time ranging from 1/10 to 1/5 of the 80min the other batteries would take... But that gets expensive