reusable bags like for Ella's Kitchen purees?

[BErriesBEllsandMOOnlight]

I'm looking for some reusable/refillable bags like Ella's puree come in so that I can make my own (slightly cheaper) quick snacks for my dd.
Any ideas?
What do people think about reusing the Ella's ones? Anyone ever do it?

I have reused Ella's ones. I cut the bottom off, and sealed it with a long freezer clip. Got about 100 from IKEA for £1 or something. Have also seen them in Sainsbury's.

or write to them and ask where they buy theirs from?

Good ideas both.

I also found these in the states thanks to my cousin. But they're expensive...

I think I'm going to try reusing the Ella's first.