Here is a new idea for those moms who have to buy formula for their little ones, and hate throwing away the container every week.
Once your babies start using bigger bottles, and taking more formula at every feeding, you're left with all the smaller bottles that you don't use anymore.
Why not try this, go ahead and measure out enough scoops of formula for the size bottle your baby is currently using. If he/she is getting cereal in their bottle you can measure that out too. You put the pre-measured formula into the smaller bottles. That way all you need is to put water in the bottles and then pour in the formula.
This makes it easier to transport in the diaper bag than the whole formula can. Just throw 2 or 3 measured bottles and then the bottle and nipple with water in it.
If you've kept your containers from the formula you can keep smaller bottles in the containers.
By doing these things you get to reuse your bottles and formula containers, plus you get the convenience of easy premeasured bottles.