Crossbody Cell Phone Bag Free Knitting Pattern: A Step-by-Step Guide to Your New Favorite Accessory

There is something uniquely satisfying about carrying a bag you made yourself. When it is a small, functional piece — the kind you grab every time you walk out the door — that satisfaction multiplies every single day. This free knitting pattern for a crossbody cell phone bag gives you exactly that: a stylish, practical, everyday accessory that you can complete in a weekend and customize to match any outfit in your wardrobe.

Whether you are a seasoned knitter looking for a quick project or an intermediate crafter ready to move beyond scarves and dishcloths, this pattern is designed to be approachable, clear, and genuinely fun to make. Read all the way through before you cast on, gather your materials, and let’s get started.

Why Knit a Crossbody Cell Phone Bag?

Before we dive into the pattern itself, it is worth talking about why this particular project has become so popular in the knitting community. Crossbody bags have been a fashion staple for years, and the miniature cell phone version — just big enough to hold your phone, a card or two, and your keys — has taken over as the go-to everyday bag for people who want to travel light.

From a knitting standpoint, this project checks every box. It is small enough to finish quickly, which means you stay motivated and actually see the finished object rather than abandoning it halfway through. It uses a relatively modest amount of yarn, so you can raid your stash and experiment with color combinations without committing to multiple skeins. It also gives you an opportunity to practice skills like working in the round, shaping a simple flap, and finishing cleanly with a strap — all of which level up your overall knitting ability.

And of course, handmade accessories make genuinely wonderful gifts. Once you have made one for yourself, you will inevitably start making them for everyone in your life.

Materials You Will Need

One of the best things about this pattern is that it requires very little in the way of materials. Here is everything you need before you cast on.

Yarn: Approximately 100 to 150 yards of worsted weight yarn (size 4). You want something with good stitch definition, since the fabric of the bag benefits from clear, visible stitches. Cotton or a cotton blend works beautifully for structure, and it holds its shape well over time. Wool or an acrylic-wool blend also works nicely if you want something with a bit more drape and warmth. Avoid anything too bulky or too slippery — super bulky yarn will make the bag stiff, and a silky yarn will make it harder to control tension.

Needles: US size 7 (4.5 mm) double-pointed needles or a short circular needle in the same size. If you prefer magic loop, a longer circular needle will work just as well. The goal is to knit in the round for the body of the bag, so choose whichever method you are most comfortable with.

Notions: One magnetic snap closure or a small button for the flap, a tapestry needle for weaving in ends, scissors, stitch markers (at least two), and a length of chain or webbing strap if you prefer not to knit your own strap. A ruler or measuring tape is helpful for checking gauge and sizing the finished bag to your phone.

Gauge: 18 stitches and 24 rows over 4 inches in stockinette stitch. Gauge matters here because the bag needs to fit your phone snugly without being so tight that inserting and removing the phone becomes a wrestling match. Take the time to swatch and adjust your needle size accordingly.

Pattern Notes and Abbreviations

Before the row-by-row instructions, here are a few notes that will make the pattern much easier to follow.

The bag is worked from the bottom up, starting with a flat bottom rectangle and then picking up stitches around the edges to work the body in the round. This gives the bag a clean, structured base. The flap is worked flat after the body is complete, and the strap is either knitted as a long I-cord or attached separately.

Abbreviations used in this pattern:

CO — cast on
BO — bind off
K — knit
P — purl
K2tog — knit two together (a right-leaning decrease)
SSK — slip, slip, knit (a left-leaning decrease)
PM — place marker
SM — slip marker
RS — right side
WS — wrong side
St(s) — stitch(es)
Rep — repeat
YO — yarn over

The Pattern

Part One: The Bottom Panel

The bag begins with a small rectangular base. This piece is worked flat in garter stitch, which gives you a nice firm foundation and eliminates any curling at the edges.

CO 20 stitches using the long-tail cast on method for a clean, sturdy edge.

Row 1 and every row: Knit across.

Continue in garter stitch (knitting every row) until the piece measures 4.5 inches from the cast-on edge. This should take approximately 22 to 24 rows depending on your gauge. Bind off all stitches but do not cut the yarn. You will use this tail when picking up stitches.

Part Two: Picking Up Stitches for the Body

This is the step that intimidates some knitters, but it is much more straightforward than it looks. You are going to pick up stitches around all four sides of the bottom rectangle so you can work the body of the bag seamlessly in the round.

Place your bottom panel with the right side facing up. Starting at one of the short ends, pick up and knit 12 stitches evenly along the short edge. PM to mark the beginning of the round.

Continue along the long edge, picking up and knitting 20 stitches. Pick up 12 stitches along the second short edge, and then 20 stitches along the remaining long edge. You should have 64 stitches total on your needles. PM to separate the sides if you find it helpful to track where the corners are.

Join to work in the round, being careful not to twist.

Part Three: The Body

Now you will work the body of the bag upward in stockinette stitch. Because you are working in the round, this means simply knitting every round.

Round 1 through Round 30: Knit all stitches.

After 30 rounds, the body of the bag should measure approximately 5 inches from the base. This is the right height for most standard smartphones. If you have a particularly large phone model, you can add 4 to 6 more rounds before moving to the flap section.

At the end of the last round, knit across 32 stitches (one full side of the bag). You are now going to stop working in the round and transition to flat knitting for the flap.

Part Four: The Flap

The flap is worked flat on the front 32 stitches of the bag. The remaining 32 stitches at the back will stay on hold while you complete the flap. You can put those live stitches on a stitch holder or let them rest on your circular needle while you work.

Turn your work so the wrong side is facing you.

Row 1 (WS): Purl across all 32 stitches.
Row 2 (RS): K1, SSK, knit to last 3 stitches, K2tog, K1. (30 stitches)
Row 3 (WS): Purl across.
Row 4 (RS): K1, SSK, knit to last 3 stitches, K2tog, K1. (28 stitches)
Row 5 (WS): Purl across.
Row 6 (RS): K1, SSK, knit to last 3 stitches, K2tog, K1. (26 stitches)
Row 7 (WS): Purl across.
Row 8 (RS): Knit across.
Row 9 (WS): Purl across.
Row 10 (RS): Knit across.

Repeat rows 9 and 10 (stockinette) four more times for a total of 14 flap rows after the decreases.

Now work a buttonhole row if you are using a button closure:

Buttonhole Row (RS): K12, BO 2, K12. (You will have two separate sections with a small gap in the center.)
Next Row (WS): P12, CO 2 using the backward loop method, P12. (26 stitches restored)

Work 4 more rows of stockinette, then bind off all stitches loosely. A loose bind-off here will keep the flap edge from pulling in.

If you are using a magnetic snap instead of a button, skip the buttonhole rows and simply work four additional stockinette rows before binding off. The snap will be attached during finishing.

Part Five: The Strap

You have two options for the strap. The knitted I-cord strap is charming and keeps the project entirely handmade, while a chain or fabric strap adds a different texture and requires less time.

Knitted I-cord strap: Using double-pointed needles and the same yarn, cast on 4 stitches. Do not turn your work. Slide the stitches to the other end of the needle, bring the yarn across the back, and knit across again. Repeat this process, never turning the work, until the cord measures 48 to 54 inches. This length creates a strap that hangs at approximately hip level when worn crossbody, but you should adjust based on your own preference and body type. Bind off and leave a long tail for attaching.

Alternative strap: Purchase 50 to 54 inches of 3/4-inch wide cotton webbing or a simple chain strap from a craft or fabric store. You will attach it to the bag using D-rings or by sewing it directly through the bag walls during finishing.

Part Six: The Back Panel Bind-Off

Return to the 32 live stitches on the back of the bag. With right side facing, bind off all stitches. This creates the clean back edge of the bag opening.

Finishing

Finishing is where this project really comes together, and it is worth taking your time here.

Weave in all yarn ends using your tapestry needle, paying particular attention to the ends at the base corners where you picked up stitches. These corners take a bit of extra wear and should be woven in securely.

If there are any gaps at the base corners from picking up stitches, use the yarn tails to close them up with a few small stitches on the wrong side.

Attach your snap closure or sew on your button now. For a magnetic snap, you will need to cut two small squares of interfacing or felt, push the snap prongs through the flap and the corresponding spot on the bag body, and fold the prongs down to secure. Most magnetic snaps come with simple instructions in the package. For a button, sew it to the center front of the bag body at a point that aligns naturally with the buttonhole in the flap.

Attach your strap. If you knitted an I-cord strap, sew each end securely to the inside upper edge of the bag on either side, pulling tight and running the thread through several times before knotting. If you are using a purchased strap, follow the hardware instructions.

Give the bag a gentle wet block if you used a natural fiber yarn. Pin it to shape, let it dry completely, and you will find the stitches even out beautifully. If you used acrylic, you can simply steam-block using an iron held slightly above the surface — never press directly onto acrylic fabric.

Customization Ideas

One of the most enjoyable parts of knitting a small accessory pattern is how much room it leaves for personalization. Here are some ways to make this pattern entirely your own.

Color blocking: Knit the base panel in one color and the body in another for a clean, modern two-tone look. You can also carry two colors throughout the body and work in simple stripes.

Textured stitch patterns: Instead of plain stockinette for the body, try a simple seed stitch or moss stitch. Both add great visual interest without complicating the pattern structure. To work seed stitch in the round, alternate K1, P1 on odd-numbered rounds and P1, K1 on even-numbered rounds so that the purls land on top of the knits and vice versa.

Embroidery: Once the bag is finished and blocked, you can add embroidered flowers, geometric shapes, or initials using a contrasting color and a tapestry needle. This is a particularly nice option if you are making the bag as a gift.

Pocket insert: If you want a bit more organization inside the bag, cut a small rectangle of cotton lining fabric, fold the edges under, and hand-stitch it inside the bag to create a pocket for cards. This is optional but makes the bag feel truly polished.

Fringe: A row of fringe or tassels along the flap edge adds a bohemian touch that works beautifully with earthy, natural fiber yarns.

Sizing Notes

The finished bag as written measures approximately 4.5 inches wide by 5 inches tall with a 4.5-inch base, which fits most standard and large smartphones. If you have a particularly small phone or just want a slimmer profile, you can reduce the cast-on for the base panel to 16 stitches and reduce the pickup count accordingly.

For a larger bag — one that fits your phone plus a slim wallet — increase the base cast-on to 24 stitches and add 6 additional rounds to the body.

It is always worth sliding your phone into the bag before you bind off the top edge, just to double-check the fit. You want the phone to slide in and out without force but without flopping around loosely either.

Yarn Recommendations

If you are purchasing yarn specifically for this project rather than using stash yarn, a few options work particularly well.

Lion Brand 24/7 Cotton in any color is a reliable, affordable choice that gives excellent stitch definition and comes in a wide range of colors. It holds its shape beautifully and is machine washable.

Paintbox Yarns Simply DK, held double, works in this pattern with a slight needle adjustment and gives a lovely smooth fabric. Drops Safran, a cotton and linen blend, creates a slightly textured finish that suits the casual, everyday nature of the bag perfectly.

If you want something with a luxury feel, a merino wool in worsted weight — like Malabrigo Rios or Cascade 220 Superwash — will make the bag feel buttery and special, though you will want to be mindful of washing instructions.

A Few Tips for Success

Always weave in ends as you go rather than leaving them all until the end. On a small project like this, tangled tails can quickly become a nuisance.

If you are new to picking up stitches, take it slowly and use the pick-up rate of approximately 3 stitches for every 4 rows on the vertical edges. The numbers given in this pattern are based on the standard gauge, but if your gauge differs, adjust your pickup count to keep the fabric even.

When working the I-cord, it helps to give the cord a gentle tug downward after every few rows to tighten up the stitches and close the tube properly.

Block the finished bag before attaching the strap and hardware. This makes it much easier to get a good shape and allows you to correct any unevenness before everything is sewn in place.

Final Thoughts

This crossbody cell phone bag is the kind of project that reminds you why you love knitting in the first place. It is small enough to pick up and put down over the course of a few evenings, satisfying enough to actually finish, and practical enough that you will reach for it every single day. The finished bag is sturdy, stylish, and — most importantly — made entirely by your own hands.

Once you have worked through the pattern once, you will find yourself making adjustments almost automatically, customizing the size, playing with color, or trying different stitch textures. That is the real gift of a project like this: it teaches you as you make it, and it gives you something beautiful to show for your time.

Cast on, enjoy every stitch, and wear your finished bag with the particular kind of pride that only comes from making something yourself.