These batteries are approximately 0.25x1.2x2.0" (6x30x48mm), and weigh about 19g (0.67oz).
QUEST Q-JET™ F41-11W WHITE LIGHTNING COMPLETE 2-MOTOR LAUNCH PACK - Q6164
Note these are flame resistant, not explosion proof.
Chute Blast Protector for up to 10" Tube.
Heavy duty 7oz Fabric, random color.