Putia is not a real word, have you spelt it correctly? respond/comment the correct word and spelling.
thanks
<span>mochila is feminine, thus, la for singular, las for plural so if it is a definite article, and una or unas if it is indefinite article.</span>
The answer to you question is. esta, esas
I put it in an image because it told me that I had written a bad word, I hope it has served you!