The source for the claim that Israel bans a long list of civilian items, however, is speculative. Kristoff and others link to a list provided by the
Gisha Legal Center.
But that list makes clear that it is anecdotal based upon what Palestinians have told Gisha. Even items supposedly banned, like chocolate, actually are not banned but are allowed to be shipped to the international organizations in Gaza which distribute food (emphasis mine):
The following list is approximate and partial, and it changes from time to time. It is based on information from Palestinian traders and businesspersons, international organizations, and the Palestinian Coordination Committee, all of whom "deduce" what is permitted and what is banned based on their experience requesting permission to bring goods into Gaza and the answers they receive from the Israeli authorities (approved or denied). It is not possible to verify this list with the Israeli authorities because they refuse to disclose information regarding the restrictions on transferring goods into Gaza. It should be noted that Israel permits some of the "prohibited" items into Gaza (for example: paper, biscuits, and chocolate), on the condition that they are for the use of international organizations, while requests from private merchants to purchase them are denied.