Any diorama builder worth his/her salt uses sandbags as a fundamental element to establish the position of the toy soldier in the battlefield scene. The sand bag establishes line of attack,static positions such as observation posts even when camouflagued, command and control positions, firing lines/sniper positions, etc. Depicting the action in and around sandbag redoubts, showing hand to hand combat, etc. all acquire heighten focus when using sandbags to establish the action in a relative localize space amidst the diorama.
Tamiya's product is simple to use and its color need not be painted. Some trimming of excess spruce is needed. The total number of individual sandbags does not lend to grand action scenes but all around I find it a great product for the hobbyist.1/35 Sand Bag Set