Use cardboard toilet paper tubes for hiding places for crickets. When you transfer the crickets from the holding container to the feeding cages, reach in the cricket cage, pick up a tube and shake the crickets into a tall plastic cup. You wont loose any that way. Just soak them in water and replace when they get dirty.
Small crickets can climb up the silicone bead on the inside edges of aquariums.
Place the tape in the corner of the aquarium so that you completely cover the silicone bead. Crickets will no longer be able to climb out. Works great on cords, wires, anything that you don't want bugs to climb on. When you buy crickets in large quantities and transfer them from the shipping box to their living quarters you loose some. Open the shipping box inside a large clean plastic garbage bag.