The shacker bag is almost any sort of backpack, duffel, large purse, or grocery bag filled with travel-sized toiletries, pyjamas (optional), lingerie (optional), and a quick change of clothes. Generally used by college students who do not plan to stay at their normal place of residence for an evening or two. The shacker bag greatly facilitates making the Walk of Shame less obvious and shameful.
The term "shacker bag" is generally used in university environments in Northern Colorado; possibly used elsewhere as well.