Las mochilas is plural and feminine. This means that your adjective must be both female and plural. The only one it could be is pequeñas
Hope this helped!
~Just a girl in love with Shawn Mendes
“I run slowly” I would say it is correct.
Vas a nesecitar una taza de leche tres cucharadas de azuca un vaso de miel y para sabor busca color para el sabor preferido y cinco tazas de harina