Here is a pretty neat and portable solution to get a dual monitor setup for your macbook.
Mountie is a $25 clip that allows you to attach your ios device to the side of your macbook. It consists of spongy grippy clips that hold on to each device with a stabilizing bar running in between them. It comes with a few different sets of pads of different thicknesses to accommodate different mac/ipad/iphone models. I'm using a macbook pro 15 mid 2014 along with an iPad air 2. The clip is really easy to attach and remove. So that's kind of cool on it's own. But it gets really neat when you pair it with Duet.
Duet is a $16 universal app. I know it's pretty pricey but worth every penny. I picked it up when it was on sale though. So this lets you use your iOS device as a second monitor for you macbook. There have been several similar apps that use wifi but this one has one big difference. It's connection is done over the lightening cable. This gives you incredible performance, reliability, and visual quality. Your iPad will look and respond just as if you had a small secondary monitor attached by hdmi or thunderbolt. This is a great portable/space saving dual monitor solution that's great for travel, on the couch, or if you just have limited desk space.
Highly Recommended. On a table the iPad works well in both portrait and landscape orientation. On your lap I find landscape to throw the balance too far off to feel all that comfortable or stable.