Generally heavly plastic bags (often tripled) inflated with oxygen will work for trips of at least serveral hous. You can reduce the chance of the animal puncturing the bags by placing them in a dark final bag. This is routinely done by shippers not just to reduce fights between animals in adjacent bags, but the dark seems to quiet them down. I usually also place the bags in a small styrofoam box to prevent wild temperature swings and to contain the water should the bag leak or be punctured.
If you want to be really sure that the animal does not stab the bag, you can also enclose it in a plastic bottle. A wide mouth pastic refrigerator jar with lots of 1/8 inch holes drilled in it works well, but you have to be careful. First, I would not recommend a jar tha came with food in it. Even when boiled, toxic compounds can be absorbed to the plastic. I've killed my share of stomatopods learning this lesson. Also, if you buy a new jar, be sure that it is not one of the ones impregnated with antibacterial or antifungal agents. These have become popular, but again, they will kill stomatopods.
For large animals such as lysiosquillids or Hemisquilla, I often use a 1 or 1.5 liter water bottle (Evian, etc.) . I drill holes in it and cut the top off just below the neck. I place the animal in the bottle and then reattache the top by sewing it back together with four or five loops of twist-tie threaded through holes. THere is lots of circulation, the animals rarely break through the container, and the bottle acts as a "burrow" giving the animal a way to stabilize itself.
Roy