AIUI, the refill pack consists of 40 bags AND 2 rolls.
Bags: 40 pack -- 22 x 30cm
Rolls: 2 rolls -- 28(W)cm x 5(L)m
Moreover, as they are "microwave, boil and freezer safe", they could probably be washed, boiled or zapped, and then reused ... if one were in immediate need.
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"No friend ever served me, and no enemy ever wronged me, whom I have not repaid in full."
We used to have a Kogan one, but it was starting to not work so well. It got replaced by an Aldi one a year ago and that one has worked flawlessly so far. A great invention I reckon.
We use it quite often. I think frozen food keeps better when "sucked". We seldom use it for food which we don't intend to freeze. Actually, our Aldi one is our second, we wore out the seals in our original Sunbeam one, and of course, it was a few years old so spare parts were unavailable.