A 40 oz tumbler with a handle fitted with the Simple Sip adapter
Stanley 40 oz Tumbler Adapter
Stanley 40 oz Tumbler Adapter
Stanley 40 oz Tumbler Adapter
Stanley 40 oz Tumbler Adapter
Stanley 40 oz Tumbler Adapter
Stanley 40 oz Tumbler Adapter
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Tumbler lid adapter

Stanley 40 oz Tumbler Adapter

Takes the place of your tumbler's lid and holds the Simple Sip filter inside. The filter is sold separately.

$9.99Pre-order
  • Sized for 40 oz Stanley style tumblers with a handle
  • Holds the Simple Sip filter inside your tumbler
  • Flexible sealing rim for a snug fit
Add the filterThe adapter holds the Simple Sip filter.
Ships early 2027Pre-order now. Charged in full at checkout.

Not ready? Join the waitlist

  • Patent pending
  • NSF/ANSI testing underway
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Description

Made for 40 oz Stanley style tumblers

This lid adapter takes the place of the lid on a 40 oz Stanley style tumbler with a handle and holds the Simple Sip filter inside, so you drink filtered water from the tumbler you already carry.

How it fits

Tumbler mouths have no thread, so the adapter seals with a flexible rim. Fit the filter into the underside, press the adapter onto the tumbler and drink.

The filter is sold separately

The adapter does not filter water on its own. One Simple Sip filter works with every adapter and pushes into a disposable bottle without one.

Simple Sip is not affiliated with Stanley or Yeti; the names describe tumbler styles.

How it fits your tumbler

The adapter takes the place of your tumbler's lid. There is no thread to line up: its flexible rim seals against the tumbler's mouth when you press it on. Fit the Simple Sip filter into the underside first.

Shipping and pre-order

Pre-orders are expected to ship in early 2027. You are charged in full at checkout and we email a tracking number the day your order leaves. If the date moves, we email you and you can cancel for a full refund. Shipping cost is shown at checkout before you pay.

A man drinks from a 40 oz tumbler with the Simple Sip lid at a camper van by a mountain lake

Made for 40 oz tumblers

Your 40 oz tumbler, now filtered.

The 40 oz adapter takes the place of the lid on 40 oz Stanley style tumblers with a handle. Fit the Simple Sip filter, fill up at any tap and drink from the tumbler you already carry.

  • Fits 40 oz Stanley style tumblers with a handle
  • Holds the Simple Sip filter inside your tumbler
  • The same filter moves to a disposable bottle on the go

Fit it in three steps

No tools needed.

Fitting the Simple Sip filter into the adapter1

Fit the filter

Fit the Simple Sip filter into the underside of the adapter.

Pressing the Simple Sip adapter onto a 40 oz tumbler2

Fit the adapter

Press the adapter onto your 40 oz tumbler in place of its lid.

A hiker drinks from a 40 oz tumbler with the Simple Sip lid3

Fill and sip

Fill up at any tap and drink through the spout. The filter does the rest.

Find your adapter

One filter. Three tumbler sizes.

Pick the adapter that matches your tumbler. The same Simple Sip filter fits all three.

You are here 40 oz Stanley style, with a handle $9.99 This adapter 30 oz Yeti style $9.99 See this adapter 20 oz Yeti style $9.99 See this adapter

Using a disposable water bottle? The filter fits it on its own, no adapter needed.

Works with

The adapter needs the Simple Sip filter.

The adapter is the lid. The filter does the filtering. Pre-order both and they ship together.

  • Fits disposable bottles on its own
  • Carbon cartridge plus micro-mesh pre-filter
  • Telescoping housing

$19.99

See the filter

What's inside

A cutaway of the housing, straight from the engineering files.

Cutaway of the Simple Sip housing showing the carbon cartridge and the pre-filter
  • Activated carbon cartridgeReduces chlorine and sediment, improves taste.
  • Micro-mesh pre-filterCatches particles before they reach the carbon.
  • Telescoping housingFood-safe silicone seals at every length.

The facts, as they stand

  • Patent pendingProvisional patent application filed.
  • NSF/ANSI testing underwayIndependent third-party testing before launch.
  • Three tumbler adapters20 oz, 30 oz and 40 oz, sold separately.
  • Easy to cleanRemovable silicone mouthpiece and a protective cap for transport.

Good to know

Questions, answered.

Fit, the filter and shipping, in plain words.

Anything else?Write to us and a person answers, not a bot.
Email Simple Sip
Which adapter do I need?

Match the adapter to your tumbler: 20 oz or 30 oz for Yeti style tumblers, 40 oz for Stanley style tumblers with a handle. A disposable water bottle needs no adapter at all.

Does the adapter work without the filter?

No. The adapter is the lid that holds the Simple Sip filter in your tumbler, so you need one filter. One filter works with every adapter.

Does it fit other tumbler brands?

The adapters are sized for 20 oz and 30 oz Yeti style tumblers and 40 oz Stanley style tumblers with a handle. Other tumblers with the same mouth may fit, but we cannot promise it. Simple Sip is not affiliated with Stanley or Yeti; the names describe tumbler styles.

When does it ship?

Pre-orders are expected to ship in early 2027. If the date moves, we email you and you can cancel for a full refund.

Not ready yet? Join the waitlist.

One email when the first batch ships, and one before it does. Nothing else.

Pre-orders are charged in full at checkout and ship early 2027.