u201d resonance also both sheet layers must be properly contained so that they cannot move or be deformed during setback and in flight having these issues in mind it may be seen that packing the liquid materials in u201c bubble wrap u201d layers improves the flight behavior of marking projectiles this applies also to other types of non rigid payload projectiles such as non lethal projectiles that carry liquid components fig1 shows a 40 mm projectile 10 of the type to which the present invention relates the various dimensions of the projectile are indicated relative to the number of calibers the projectile has an ogive 12 that carries one or more marking agents including liquid chemical materials which react when missed these liquids are contained and constrained in a matrix package of bubble wrap sheets as will be explained below which maintains the stability of the projectile in flight the bubble wrap sheet according to the invention is illustrated in fig2 a 2 b and 2 c fig2 a shows a plastic sheet 14 containing depressions or u201c bubbles u201d 16 filled with a liquid 18 once filled a cover sheet 20 is applied and heat sealed to the sheet 14 to form a composite sheet 22 this composite sheet is shown in perspective in fig2 c fig3 shows the interior of the head ogive 12 of the projectile 10 without the u201c bubble wrap u201d sheets according to the invention that contain the reactive liquid chemical materials the wall of the ogive 12 is formed of a plastic or composite material or of a thin walled metal the inner surface of the wall is provided with small indentations to receive the bubbles of the bubble wrap sheets.