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                <link href=',700' rel='stylesheet' type='text/css'>
<link href=',400,700' rel='stylesheet' type='text/css'>
<div id="container">
		<div class="box" id="box1">Drag and throw me</div>
		<div class="box" id="box2" style="background-color:red;">Drag and throw me too</div>
<div class="controls">
					<li class="controlsTitle">Options</li>
						<label><input type="checkbox" name="snap" id="snap" value="1" /> Snap end position to grid</label>
						<label><input type="checkbox" name="liveSnap" id="liveSnap" value="1" /> Live snap</label>


                body {
  font-family: Signika Negative, Asap, sans-serif;

#container {

.box {
	background-color: #91e600;
	text-align: center;
	font-family: Asap, Avenir, Arial, sans-serif;
	width: 196px;
	height: 100px;
	line-height: 100px;
	color: black;
	position: absolute;
	-webkit-border-radius: 10px;
	-moz-border-radius: 10px;
	border-radius: 10px;

.controls {
	background-color: #222;
	border: 1px solid #555;
	color: #bbb;
	font-size: 18px;
  margin: 20px 0;
.controls ul {
	list-style: none;
	padding: 0;
	margin: 0;
.controls li {
	display: inline-block;
	padding: 8px 0 8px 10px;
.controls input {
  cursor: pointer;
.controls .controlsTitle {
  border-right:1px solid #555; 


See for details. 
This demo uses InertiaPlugin which is a membership benefit of Club GreenSock,

var $snap = $("#snap"),
  $liveSnap = $("#liveSnap"),
	$container = $("#container"),
	gridWidth = $("body").width() / 5,
	gridHeight = 100,
	gridRows = 6,
	gridColumns = 5,
	i, x, y;

//loop through and create the grid (a div for each cell). Feel free to tweak the variables above
for (i = 0; i < gridRows * gridColumns; i++) {
	y = Math.floor(i / gridColumns) * gridHeight;
	x = (i * gridWidth) % (gridColumns * gridWidth);
	$("<div/>").css({position:"absolute", border:"1px solid #454545", width:gridWidth-1, height:gridHeight-1, top:y, left:x}).prependTo($container);

//set the container's size to match the grid, and ensure that the box widths/heights reflect the variables above
gsap.set($container, {height: gridRows * gridHeight + 1, width: gridColumns * gridWidth + 1});
gsap.set(".box", {width:gridWidth, height:gridHeight, lineHeight:gridHeight + "px"});
gsap.set("#box2", {left: gridWidth * 2})

//the update() function is what creates the Draggable according to the options selected (snapping).
function update() {
  var snap = $snap.prop("checked"),
      liveSnap = $liveSnap.prop("checked");
	Draggable.create(".box", {
		bounds: $container,
		edgeResistance: 0.65,
		type: "x,y",
		inertia: true,
    autoScroll: true,
		liveSnap: liveSnap,
			x: function(endValue) {
				return (snap || liveSnap) ? Math.round(endValue / gridWidth) * gridWidth : endValue;
			y: function(endValue) {
				return (snap || liveSnap) ? Math.round(endValue / gridHeight) * gridHeight : endValue;

//when the user toggles one of the "snap" modes, make the necessary updates...
$snap.on("change", applySnap);
$liveSnap.on("change", applySnap);

function applySnap() {
	if ($snap.prop("checked") || $liveSnap.prop("checked")) {
		$(".box").each(function(index, element) {, {
				x: Math.round(gsap.getProperty(element, "x") / gridWidth) * gridWidth,
				y: Math.round(gsap.getProperty(element, "y") / gridHeight) * gridHeight,
				delay: 0.1,
				ease: "power2.inOut"