Menstrual Cup Folds: 7 Ways to Fold a Cup (and Which One to Use)

Menstrual Cup Folds: 7 Ways to Fold a Cup (and Which One to Use)

If your menstrual cup hurts on insertion, won't pop open inside, or keeps leaking, the fold is almost always the first thing to change. Most first-time users learn the C-fold, give up when it doesn't work, and assume cups aren't for them. They are — you just need a better fold for your body.

Here are the 7 most useful folds, what each one does, and how to match a fold to your situation.

Why the Fold Matters

The fold controls three things:

The "right" fold isn't universal. It depends on your anatomy (cervix height, vaginal canal width, pelvic floor tone) and the cup's firmness.

• How small the cup is at the moment of insertion — smaller = less stretch, less discomfort.
• How easily the cup pops open once it's inside.
• Where the seal forms — some folds open low, others open higher up the canal.

The 7 Folds

1. C-Fold (also called U-fold)

How: Press the cup flat, then fold it in half so the rim forms a "C" or "U" shape.

• Insertion size: Medium — about half the cup's diameter.
• Pops open: Easily — this is the most reliable opener.
• Best for: Beginners on average anatomy, cups that are hard to open.
• Avoid if: You have a low cervix or tight pelvic floor — the rim stays wide.

2. Punch-Down Fold (the most recommended for low cervix)

How: Push the rim down into the cup with your index finger, creating a single point at the top.

• Insertion size: Smallest of any fold — only the tip enters first.
• Pops open: Sometimes needs a small twist or wiggle.
• Best for: Low cervix, tight pelvic floor, sensitive insertion, beginners on a low cervix cup like Leia.
• Avoid if: You have a very firm cup that won't reopen — it can stay folded.

3. 7-Fold (Triangle 7)

How: Flatten the cup, then fold one top corner diagonally down to the opposite bottom edge — it looks like the number "7".

• Insertion size: Small to medium — narrow at the tip.
• Pops open: Reliable.
• Best for: Low cervix, narrow vaginal canal, anyone who finds the C-fold too wide.
• Bonus: Easy to hold without slipping.

4. Triangle Fold (also called the diamond)

How: Flatten the cup, fold one corner down to the center, then fold the other corner down to meet it — a triangle pointing up.

• Insertion size: Small.
• Pops open: Good.
• Best for: Anyone whose 7-fold feels close but not quite small enough.

5. Labia Fold (also called the heart or pizza fold)

How: Fold the cup in half (C-fold), then bend the top corners down so the rim looks like a heart or a folded slice of pizza.

• Insertion size: Small.
• Pops open: Reliable.
• Best for: Beginners who want a smaller tip than the C-fold but easier popping than the punch-down.

6. S-Fold

How: Squeeze the cup flat, then make an S-shape by folding one half forward and one half back.

• Insertion size: Small.
• Pops open: Good in most anatomy.
• Best for: People who find the C-fold uncomfortable and the punch-down hard to open.

7. Diamond Fold (also called the origami)

How: Fold the rim down into a diamond by pinching two opposite sides toward each other.

• Insertion size: Very small at the tip.
• Pops open: Variable — depends on cup firmness.
• Best for: Sensitive users who want the smallest possible insertion point but find the punch-down too unreliable.

Pick a Fold by Problem

Step-by-Step: How to Insert with Any Fold

• Relax. Tense pelvic floor muscles make every fold harder. Take three slow belly breaths first.
• Find a comfortable position — squat, one foot on the toilet, or sitting on the edge.
• Fold the cup and hold it firmly at the rim so it can't pop open in your hand.
• Aim toward your tailbone, not straight up. The vaginal canal angles backward.
• Insert just past the vaginal opening — the cup should sit low, around the cervix. Cups are not meant to go up as high as tampons.
• Release your grip and let the cup open. You should feel or hear a small "pop" or suction sound.
• Run a finger around the base to check the cup has fully opened. If you feel a dent, rotate the cup or gently press the vaginal wall away from it.
• Tug gently on the stem. A small resistance means the seal is good.

When to Try a Different Cup Instead of a Different Fold

If you've tried 3–4 folds across 2 cycles and the cup still hurts, leaks, or sits too low — the cup itself may not fit your anatomy. The most common mismatch is cup length vs cervix height: most cups on the market are designed for an average-to-high cervix and are simply too long for the ~30% of women with a low cervix.

Leia was designed specifically for low and average cervix anatomies — short, anatomically shaped, with a reinforced rim that pops open reliably even on the punch-down fold. If you're not sure which size fits you, take the 60-second cup finder quiz.

The Bottom Line

There's no single "best" fold. The best fold is the one that lets you insert comfortably and reliably pops open inside. Start with the punch-down if you have a low cervix or tight pelvic floor; start with the C-fold if you want maximum pop-open reliability. Switch folds if the first one isn't working — most cup problems disappear when the fold changes.

Reviewed by Elena Dolgan, M.D., OB-GYN and founder of Leia. Educational content, not medical advice.

Leia Cup — menstrual cup designed by an OB-GYN for a low cervix. Shop Leia Cup · Find your size