What is the OVALWARE RJ3 Airtight Cold Brew Coffee Maker?
A single borosilicate glass vessel that brews, filters and stores 1.5 litres without decanting.
OVALWARE publishes a 1.5 litre capacity, a superfine laser cut 18/8 stainless steel filter described as medical grade, a stainless steel lid and an airtight seal the maker says keeps the coffee fresh for up to two weeks. It weighs 1.3 pounds empty and carries a 90 day guarantee.
The same body takes loose leaf tea, hot or cold, which is unusual in this category.
Airtight, and what it is actually protecting
Cold brew concentrate goes flat before it goes off, and air is why.
A jug covered with a lid loses aromatics steadily, so by day four the coffee tastes duller than it did on day one even though nothing has spoiled. That is the difference an airtight seal addresses, and on a 1.5 litre batch it matters more than on a small one, because a large batch is by definition being drunk over days.
So the seal and the capacity are one decision rather than two. Brewing a litre and a half only makes sense if the last glass is worth drinking.
One vessel, and the trade that comes with it
Nothing is transferred, which is convenient, and the grounds do not leave.
Systems like the OXO 32oz drain the concentrate into a separate carafe, so the coffee finishes extracting the moment it separates. Here the filter basket lifts out but the brewing and the storing happen in the same body.
In practice that means removing the filter promptly rather than leaving it soaking, and it is the one habit this design asks of you. In exchange there is one object to wash instead of three.
OVALWARE RJ3 vs OXO Good Grips 32oz
More coffee and better storage against more control and a cleaner cup.
OVALWARE holds 1.5 litres to OXO's 946ml, seals airtight, and filters through laser cut stainless. OXO spreads the water with a rainmaker lid, lets you stop filtration with a switch, supports paper filters as well as mesh, and separates the concentrate from the grounds.
If you brew a big batch weekly, the OVALWARE is the better shape. If you brew often and care how the cup tastes rather than how long it lasts, OXO gives you the levers.
Is the OVALWARE RJ3 worth it?
It is worth it for volume drinkers who keep coffee in the fridge for days at a time.
Borosilicate glass, an 18/8 filter and a genuine seal is a serious specification for a vessel with no moving parts, and 1.5 litres is the largest batch in this category.
The 90 day guarantee is the shortest cover here and the weakest number on the sheet, which is worth weighing for a glass object of this size.
Who should buy the OVALWARE RJ3 (and who should not)
Buy it if you brew once and drink all week.
It suits a household getting through a litre and a half, anybody who also steeps loose leaf tea, and people who would rather own one attractive vessel than a system in parts. It stores in a fridge and pours at the table.
Do not buy it if you want the coffee separated from the grounds automatically, or if a paper-filtered cup is what you are after. And if your fridge is small, the Hario Mizudashi at 600ml is the shape that fits a door shelf.
Frequently Asked Questions
How much does the OVALWARE RJ3 hold?
1.5 litres, listed as 51oz, which is the largest capacity among the immersion brewers we have measured.
How long does cold brew keep in the OVALWARE?
The maker states the airtight seal locks in freshness for up to two weeks. That is a claim about aroma holding rather than about safety.
Can you make tea in the OVALWARE RJ3?
Yes. OVALWARE publishes compatibility with loose leaf tea, brewed hot like a teapot or cold in the fridge, using the same stainless filter.
What warranty does the OVALWARE RJ3 have?
A 90 day warranty alongside a satisfaction guarantee, which is the shortest published cover among these brewers.
