Minimalist LSP Heat Pack

The hottest lumps, but they are on the inside.

Over the past couple of years, my wife and I have binged our way through Adventure Time, and have both come to realize that Lumpy Space Princess (LSP) is by far one of the greatest things about the show.  As the ninth-and-final season approaches, we honor Her Lumpiness with a microwaveable heat pack.

You might remember that we live in Phoenix and ask, “Why do you need a microwaveable heat pack?  Isn’t it hot there?”

Don’t I lumping know it!

However, my wife loves these things, and as a show of my undying affection for her (and because I’ve been wanting to learn to sew for a while now), I took one for the team.


My mother-in-law taught me the basics on my mom’s mom’s old Singer sewing machine (mom-ception).  It was scary at first, and I messed up a bit at the beginning, but ultimately gained a fun new skill I’ll hopefully have time to cultivate this upcoming year.

Parts List:

Snuggle Flannel Prints – Joann Fabric (The one I found locally was called “Purple Magic Blender.”  You don’t need a lot, so grab 1/4 yard.)

Yellow Fabric – Joann Fabric (I bought 1/4 yard of generic cotton fabric, but looking back, it might have been better to get some felt or flannel or something else that is less prone to fraying over time.  Remember, this was my first rodeo.)

Yellow Thread – Joann Fabric

Rice – 3 Cups UNCOOKED

Helpful Tools:

Sewing Machine (If available.  In theory, you should be able to easily stitch this by hand.)


Fabric Scissors (These are apparently a thing.)


Ruler (or other means of measuring.)

Paper (For drawing / tracing the star.)

Pen (Also drawing / tracing star.)

  1. Draw / Trace / Cut Star

    As I’ve had a lengthy chunk of time off of work for the holidays, I threw a lot of my more-scientific methods out the window and sketched/cut a star out freehand.  It turned out to have all the right lumps in all the right places though.

    Admit you can't resist my lumps!

    My name is "Duchess Gummybuns!"

  2. Measure / Cut Main Bag

    This is literally a rectangle folded in half to become a square.  Mine measured out to around 9 1/2″ x 9 1/2″.

    I totally saw Hot Dog Princess get sucked in here, and I wasn't invited?! I was all, "What the lump?" so I'm crashing this party.

  3. Applique The Star

    Because I used basic cotton fabric, My MIL showed me how to apply a zigzag stitch to mitigate with fraying.  I went over it a couple of passes just to be sure.

    These lumps. I know you want to slump up on these lumps. But you can't cuz you're a chump. A chu-u-u-u-u-ump.

  4. Clean Up Ends

    Fold the top and bottom edges in (about 1/4″ each side), hold them in place with pins, and straight-stitch away to prep for a clean final seam.


  5. Sew Sides

    Starting with the fabric inside-out, fold in half, pin the sides together, and straight-stitch them together.  If necessary, go over them a couple of times to ensure there won’t be any leaks.  Flip the fabric back to outside-out and it should look like this:

    Well if you want these lumps, you gotta put a ring on it.

  6. Fill and Finish

    Rice goes in.

    Oh, my Glob. What the stuff are you doing?

    And then pin and straight-stitch the opening closed.  Check for leaks and fix where/if necessary.

Nuke for a minute whenever you need something hot and lumpy to hold onto.

For those who haven’t yet been introduced to Adventure Time, at the time of this posting, all current seasons/episodes are on Hulu+.

For those who may have automatically written the show off as childish, I’d recommend the Conversation Parade podcast with John Moe and Mike Eagle.  There is a significant amount of depth below the surface that these guys unpack better than I could.

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