We send each ThriftBag individually.
(This is a quirk of Royal Mail's pricing, as we send each ThriftBag as a large letter, rather than three together which would be a small parcel ... )
So, your other ThriftBags would have been dispatched at the same time, but have been delayed in the Royal Mail network.
Please wait a couple more days, and if they don't arrive, please get in touch.
This process is subject to change within the next couple of weeks so this will no longer be an issue!