Can the sliding mechanism on the (30oz) lid be disassembled for washing? My milky tea gets inside and is starting to get crusty/flaky...

I have the older version of the lid too. It usually comes out clean if you put it through the dishwasher but needs a good shake afterwards. You can also try holding it sideways under warm running water for a min and then vigorously shake it over the sink. Try the other side and repeat. Do this with the lid closed and opened.

Is there a way to keep the straw from rattling around? I use it in a quiet office and it so noisy.

You can get silicone bumpers that slide onto the straw on either side of the lid, to hold the straw in place and keep it quiet. Some products even come with tips as well as bumpers, in case you don’t care for the metal straw hitting your teeth. Amazon sells them. I have had zero rattling since I started using them, and I enjoy the tips, no burning your lips on a hot straw.

Just got mine in and I love it. I can tell I’ll need more straws so what size should I get? I like the wide straight one. What size is it?

I have a 40oz Beast which I love. I use the metal extra long straws, however, the regular size metal straws can work.

Can u use this cup without the straw

Mine has no vent which makes it difficult to get much liquid out. I’m considering returning it as I don’t like drinking out of a straw.

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Beast 20 oz Tumbler Stainless Steel Vacuum Insulated Coffee Ice Cup Double Wall Travel Flask (Aquamarine Blue)

Beast 20 oz Tumbler Stainless Steel Vacuum Insulated Coffee Ice Cup Double Wall Travel Flask (Aquamarine Blue)

Product ID: 40006523

Details

Brand
Greens Steel
Capacity
20 fluid
Color
Aquamarine
Material
Plastic
Special Feature
Insulated

🔒Double-wall vacuum insulation locks in temperature all day

🧼Pop-up lid + straw brush for effortless cleaning

❄️20 oz capacity keeps drinks icy cold or piping hot

€ 63.89

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Description

🔥 Stay cool or stay hot—your perfect sip companion, wherever life takes you!

BONUS STRAW BUNDLE - Two unbreakable straws tailored for every sip—smoothies or water, your call.
ULTIMATE TEMPERATURE LOCK - Keeps your coffee hot or your iced drinks cold for hours—no compromises.
SWEAT FREE STYLISH FINISH - No condensation, no scratches, just sleek Aquamarine Blue that stands out.
PREMIUM 304 STAINLESS STEEL - Food-grade, rust-resistant, and built to last through every hustle.
TRAVEL READY SPLASH PROOF - Pop-up lid seals tight for spill-free commutes and on-the-go hydration.

The Beast 20 oz Tumbler by Greens Steel is a premium, vacuum-insulated stainless steel flask designed for professionals on the move. Featuring double-wall insulation, a splash-proof pop-up lid, and a durable powder-coated finish, it keeps beverages hot or cold for hours. The tumbler includes two specialized unbreakable straws and a cleaning brush, all packaged in a sleek gift box. Crafted from high-grade 304 stainless steel, it offers a sweat-free, rust-resistant experience perfect for travel and daily use.

Specifications

ASIN	B01N9S2RE8
Age Range Description	Adult
Best Sellers Rank	#1,480 in Kitchen & Dining ( See Top 100 in Kitchen & Dining ) #31 in Insulated Tumblers
Brand Name	Greens Steel
Capacity	20 fluid ounces
Color	Aquamarine Blue
Customer Reviews	4.6 4.6 out of 5 stars (81,555)
Finish Types	Coated
Included Components	Handle, Lid, Straw
Item Dimensions W x H	3.82"W x 3.7"H
Item Weight	15.2 ounces
Manufacturer	Greens Steel
Manufacturer Part Number	14181674
Material Features	Insulated
Material Type	Plastic
Material Type Free	BPA Free
Model Number	14181674
Number of Items	5
Occasion	Travel
Other Special Features of the Product	Insulated
Pattern	Solid
Product Care Instructions	Dishwasher Safe
Product Style	550 ml
Recommended Uses For Product	Travel
Reusability	Reusable
Shape	Conical
Size	20 Ounces
Specific Uses For Product	Cold Drinks
Theme	No theme
Unit Count	1 Count

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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€ 63.89

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

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