Blitting Question on SpriteSheet Left/Right Animation

hi guys, wanna know your opinion on directional sprites in spritesheet.

Many tutorials I have seen have 1 single large spritesheet
that contains a sprite (along with its action animation, example: walking)
It has sprites of a character walking left, and walking right.

I feel that this bloats up the spritesheet file size.

So I was thinking of a better method.

How about only having a spritesheet that contains walking to the left animation.
And when we want to get animation of walking to the right,
just flip the spritesheet to the right (flipping the bitmapdata using matrix?)
And copy that right animation into the canvas.

[COLOR=“DarkOrange”]Isn’t this better? Whats your opinion?[/COLOR]