Never Before Seen

One bottle.
Two sides.

FlexDuo splits your shaker in half — 14 oz of pre-workout on one side, 14 oz of protein on the other. Fill both at breakfast. Shake whichever one you need, whenever you need it.

Get FlexDuo →

$22.99 · one bottle, two chambers

14ozside A

14ozside B

28oztotal capacity

2×flip-top spouts

Why Two Sides

Stop carrying two bottles.

Pre-workout and protein don't mix — literally. Most people end up hauling two shakers to the gym, or rinsing one out mid-session. FlexDuo keeps both ready in a single bottle, sealed apart until you flip it and shake.

Side A

Before you lift

Load your pre-workout or BCAAs on one side. Shake it on the way into the gym, cap stays sealed on the other side.

14oz capacity

Side B

After you lift

Protein's already measured out and waiting on the second side. No mixing mid-workout, no second bottle in your bag.

14oz capacity

First Of Its Kind

There's nothing
built like this.

Every other shaker on the market holds one thing. FlexDuo is the first bottle with two fully sealed 14oz chambers, so one bottle does the job of two.

Built In

What's actually in the bottle.

Two independent chambers

A center seam fully separates both sides — what's in Side A never touches Side B.

Dual flip-top spouts

Each chamber gets its own flip cap, so you open and shake one side at a time.

Leak-resistant seal

Gasketed caps lock down tight on both sides, so nothing leaks between chambers or into your bag.

Rubber-grip handle

A textured rubber handle spans the cap — grippy in a sweaty hand, easy to clip to a bag or belt.

Dishwasher safe

Both chambers and both caps go straight in the dishwasher — no hand-scrubbing two lids a day.

BPA-free

Every part that touches your drink, on both sides, is made without BPA.

Printed measure lines

Ounce markings run up each chamber, so you can eyeball a dose without guessing.

28oz total

14oz a side is enough for a full scoop of most pre-workouts and a standard protein serving.

Smoke-tint shell

See how much is left on either side at a glance, without popping either cap.

How It Works

Fill once, shake twice.

Fill Side A

Pre-workout, BCAAs, creatine — whatever you're taking before you lift.

Fill Side B

Your post-workout protein, measured and capped, ready for when you're done.

Flip. Shake. Repeat.

Open one cap at a time, shake that side only, and the other stays sealed until you need it.

Order Now

Never carry two bottles again.

FlexDuo ships direct. Two sealed 14oz chambers, leak-resistant caps, dishwasher-safe, BPA-free, rubber-grip handle — everything above, in your gym bag.

FlexDuo $22.99

Smoke / Orange · 2×14oz chambers

Quantity

Secure checkout · Ships in 2–4 business days

One bottle.Two sides.