Hot Homemade Lunches Anywhere—Zero Microwave Lines.
Ditch lukewarm plastic containers and deep, knuckle-scraping soup cylinders.
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Every detail of the Cosari ThermoBowl 900 is built around real workday ergonomics—from 6:00 AM kitchen prep to 12:00 PM truck-cab lunches and 10-second evening cleanup.
Pre-warm the seamless 304 austenitic stainless steel bowl with hot water for 5 minutes, pack your piping-hot meal, and enjoy warm comfort food 3 to 4 hours later without hunting for an outlet or microwave.
Over twice as wide as standard soup thermoses. The shallow 900 ml (30.4 oz) bowl lets you lay chicken wings, stir-fry, and pasta flat so you never mash your meal or scrape your knuckles on deep metal walls.
Cooling steam welds traditional screw-top jars shut. Our integrated dark gray silicone air-vent plug equalizes internal pressure in one second with a quick thumb lift so the lid comes off effortlessly.
Two contoured side latches lock the silicone-ringed lid down with an audible click to prevent backpack spills, while the arched top handle flips up for easy carrying and folds flat for storage.
Pour boiling water into the polished 304 stainless steel interior and rest the lid on top for 5 minutes. This pre-heats the steel thermal wall so it won't steal heat from your food. Dump the water and immediately fill the bowl with piping-hot leftovers.
Place the snap-fit lid onto the rim, press the dark gray silicone air-vent plug flush into its seat, and snap both side-clip latches down until they click. Lift by the arched top handle and head out for your shift.
At lunchtime, lift the edge of the dark gray silicone air-vent plug for 1 second to release internal steam suction. Unclip the two side latches, remove the lid, and enjoy a hot meal directly from the wide stainless steel bowl.
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900 ml (30.4 oz) Wide-Mouth 304 Stainless Steel Insulated Lunch Bowl with 1-Second Silicone Steam-Release Vent & Dual Leak-Resistant Latches
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30-Day Money-Back Guarantee plus a full 2-Year Warranty.
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Built for Real Meals, Not Just Thin Soup: Unlike tall, narrow beverage thermoses that force you to fish food out of a dark tube, the Cosari ThermoBowl 900 features a 150 mm (5.9-inch) wide circular mouth and a shallow, curved 304 stainless steel interior. Whether you pack bone-in chicken wings, beef stew, dumplings, or chicken and rice, you can eat comfortably with a standard fork or spoon and wipe the seamless interior clean in 10 seconds.
The 5-Minute Prime Protocol for 3–4 Hour Warmth: At just 310 grams empty, the ThermoBowl 900 gives you featherlight daily portability without lugging a 2-pound steel cylinder. To lock in maximum heat for 3 to 4 hours (or up to 5 hours inside an insulated lunch bag), always pre-warm the stainless steel bowl with boiling water for 5 minutes before packing hot food, then seal the dark gray silicone vent plug and both side latches.
Materials, Care & Safety Notes: Inner bowl: Food-grade 304 austenitic stainless steel (BPA-free, odor-proof, rust-resistant). Outer shell & lid: Cool-touch matte polypropylene with food-grade silicone perimeter gasket and dark gray silicone air-vent plug. Do not place in a microwave or oven. Hand-wash recommended.
Free 5–7 Day US Shipping: Every order ships free with full tracking and delivers in 5 to 7 business days.
30-Day Trial: Try it at home for 30 days risk-free. Need help? Email us anytime at support@buycosari.com.
2-Year Warranty: If anything goes wrong within 2 years, we replace it free of charge or refund your order in full.
Zero plastic contact with your hot meal, zero lingering curry or garlic odors, and zero metallic aftertaste—just pure, hygienic food-grade 304 stainless steel from rim to base.
Weighs less than half as much as a 730g heavy steel thermos while keeping the matte outer wall completely cool to hold on your lap or truck console.
No deep corners, no narrow necks, and no multi-piece internal screw threads to trap rotting soup—sticky rice wipes right out with one pass of a kitchen sponge.
Cosari ThermoBowl 900Standard Competitors
| Feature | Cosari ThermoBowl 900 | Standard Competitors |
|---|---|---|
| Opening Geometry & Spoon Access | Wide 5.9" (150 mm) shallow bowl—fits wings, ribs & pasta flat | Narrow 2.7"–3.3" deep tube—scrapes knuckles & mashes food |
| Steam Suction Lid Release | 1-second dark gray silicone air-vent plug equalizes pressure | Unvented screw caps vacuum-lock shut as steam cools |
| Empty Carry Weight | Featherlight 310g with fold-flat arched top handle | Heavy 650g–750g bulky steel cylinders |
| Closure & Spill Security | Dual audible side-clip latches + perimeter silicone seal | Rotational screw stoppers with deep food-trapping threads |
| Evening Sink Cleanup Time | 10-second sponge wipe across shallow threadless stainless bowl | Requires a long bottle brush to scrub dried rice from bottom |
Swipe left for steps 2 and 3
Pre-warm the 304 stainless steel bowl with boiling water for 5 minutes, pour it out, and load your piping-hot chicken wings, rice, pasta, or soup.
Seat the snap-fit lid, press the dark gray silicone air-vent plug flush, click both side latches shut, and carry effortlessly by the arched top handle.
At noon, pop the gray silicone air-vent plug to release steam suction, unclip the latches, and eat straight from a wide, knuckle-free stainless bowl.
I bought two of these round bowls for days when I can't get to a microwave. The matte outside feels sturdy, and the stainless inner bowl cleans up nicely. My lunch stays warm for hours, and the clips and vented lid have kept everything contained.
I bought three for my kids for Christmas, and they use them all the time. My son packed hot chicken wings in his insulated lunch bowl, and they were still warm four hours later at lunch. The wide shape is perfect for them.
My son works outdoors with no microwave or restaurants nearby, so I got him this for lunch. He loves taking different meals now, and they're still warm at his midday break, about 3 to 4 hours later. The arched handle makes it easy to carry. Ordering another!
My favorite lunch container so far! It feels better made than the others I've tried, and the bright sky-blue matte finish is such a pretty color in person.
This stainless-lined lunch bowl is so much nicer than the flimsy plastic containers I used before. I pack my food hot in the morning and it's still warm when I eat lunch.
I worked in a coal mine and winter shifts could get frigid. I tucked this wide stainless-lined bowl into my work bag with chicken and rice inside. At midday I popped the gray silicone vent plug and the lid opened smoothly. Lunch was still warm.
I've used insulated containers for work lunches for years, and this latched bowl does a nice job. My tip is to prime the stainless steel interior with boiling water, then empty it before adding your hot food. Makes a noticeable difference for me.
I heat vegetable soup before leaving for work, and it's still warm when I open it for lunch about three hours later. The side clips and silicone vent seal have kept it from spilling in my bag. Love having homemade soup at work!
I got tired of scraping sticky food out of deep, narrow jars and banging up my knuckles. This bowl is wide and shallow, so sticky rice and sauces wipe right off the smooth stainless interior. Even the mess after ribs is easy to clean.
I fill the stainless inner bowl with hot tap water for five minutes, empty it, then add hot pasta or rice and snap both side latches shut. My food is genuinely warm when I eat three to four hours later.
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When pre-warmed with boiling water for 5 minutes and filled with piping-hot food, the ThermoBowl 900 keeps meals warm for 3 to 4 hours—the exact window between morning prep and a midday lunch break. If you work in freezing outdoor conditions or want up to 5 hours of warmth, simply tuck the bowl inside a standard insulated lunch bag.
No. The inner liner is made of solid food-grade 304 stainless steel, which must never be placed in a microwave or oven. Always heat your food thoroughly in a pan, pot, or microwave-safe plate before spooning it into the pre-warmed ThermoBowl.
No. That is why we built the dark gray silicone air-vent plug directly into the top of the snap-fit lid. Before unclipping the two side latches at lunch, simply lift the edge of the silicone vent plug for one second to equalize internal steam pressure—the lid lifts right off with zero struggle.
900 ml equals approximately 30.4 fluid ounces (nearly 3.8 cups). Because of its wide 5.9-inch circular bowl shape, it easily holds a full adult dinner portion—such as 8 to 10 roasted chicken wings, a hearty bowl of beef stew, or chicken breast over fried rice.
Not at all. The double-wall construction pairs the 304 stainless steel interior with a smooth matte polypropylene exterior shell that stays completely cool to the touch, even when filled with boiling soup—so you can hold it comfortably on your lap in a truck cab.
Every order is protected by our 30-Day Hot-Lunch Shift Guarantee and a 2-Year Latch & Seal Warranty. Pack your favorite hot leftovers for up to 30 days; if you aren't thrilled with how warm your meal stays or how easily the bowl cleans up, return it for a full refund.