I don’t think that 250gm is the issue as far as I understand, even though some of the extra small ebay satchels were printed 250gm, this was a misprint and you can send up to 5kg, although it is difficult to imagine anything of that weight fitting into these satchels.

Oh where did I put those lead fishing weights 🙂

So I guess that the size of the package is vital, which should measure no more than the XS satchels, rather than the weight.

I think if people are packing an item up to 250gm in any size box, they will be in for a nasty surprise.