High-fragmenting flashbang grenade charge holder

A flashbang grenade comprising:

• a flashbang grenade body;
• a flexible envelope made from a flexible sheet material of foil formed from a metal or a metal alloy, the flexible envelope defining an interior volume to receive and retain therein a charge having a charge volume less than or equal to the interior volume, the flexible envelope comprising a first end portion, a flexible sidewall, and a second end portion, the first end portion of the flexible envelope comprising an opening to receive a charge volume of a pyrotechnic material, the second end portion of the flexible envelope being closed, with the flexible sidewall extending between the first end portion and the second end portion;
• and
• a charge of a pyrotechnic material having a charge volume less than or equal to the interior volume,
• wherein a ratio of the charge volume to an envelope material volume is 5.0 or greater.