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Wheat vs Rice vs Lupin Fillings: Which Heat Pack Is Best?
Ever wondered what’s really inside your heat pack?
If you’ve ever popped a heat pack in the microwave and thought, “Why does this one smell different?” or “Why does mine cool down so quickly?” — you’re not alone.
The secret is the filling.
The grains inside your pack do more than just get warm — they decide how long the heat lasts, how the pack feels, and even what kind of scent fills the room. Today, we’re breaking down the three most popular fillings — wheat, rice, and lupin — so you can find the one that suits your body and lifestyle best.
Why what’s inside actually matters
Each grain has its own little personality.
Some hold heat longer, others feel softer or lighter, and a few even release a scent that helps you unwind after a long day.
When you microwave a heat pack, the grains trap warmth and slowly release it back — that’s what gives you that deep, soothing comfort. But not all grains behave the same way, so choosing the right one makes a world of difference.
For more on the safe application of heat therapy, here’s a clinical guide that outlines proper heat usage and burn prevention.
Wheat Heat Packs — the timeless classic
Wheat has been the go-to filling for decades, and for good reason: it’s reliable, comforting, and feels like an old friend.
Why people love it:
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Holds warmth beautifully for up to 45 minutes.
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Has that nostalgic, soft grain feel.
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Gives off a mild, earthy scent that feels calming.
Things to keep in mind:
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Can dry out if overheated repeatedly.
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Slightly heavier than rice or lupin.
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May develop a faint “toasty” smell over time — harmless but noticeable.
Perfect for: Everyday aches, bedtime warmth, and anyone who loves that classic wheat-bag comfort.
Rice Heat Packs — light and neutral
Rice is a simple, natural filler that many people already have at home. It’s lightweight, affordable, and feels beautifully smooth against the skin.
Why people choose rice:
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Heats evenly and quickly.
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Almost no scent — great if you’re sensitive to smells.
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Slightly lighter than wheat, so it molds easily around your neck or shoulders.
Small drawbacks:
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Doesn’t hold heat quite as long.
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More prone to scorching if overheated.
Perfect for: Short bursts of relief or those who prefer a barely-there weight and neutral scent.
Lupin Heat Packs — the new favourite
If you’ve tried a lupin heat pack, you know the difference immediately. The texture is softer, the warmth lasts longer, and it somehow feels… premium.
Why lupin is gaining fans:
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Retains heat for longer without drying out.
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Naturally low in moisture — less risk of overheating.
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Hypoallergenic and odour-neutral (a big win for sensitive users).
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Light and silky in texture.
Downsides:
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Slightly higher cost.
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Different feel — some describe it as “bean-like,” but still soft.
Perfect for: People who want long-lasting warmth, fewer allergens, and a gentle, luxe feel.
Learn more about lupin food allergy and cross-reactivity with peanut.
Because lupin is now classified as an allergen in Australia, it’s important to know why lupin must be labelled as an allergen.
Quick comparison
| Filling | Heat Retention | Weight | Scent | Texture | Best For |
|---|---|---|---|---|---|
| Wheat | ★★★★☆ | Medium-Heavy | Mild/Nutty | Classic grain | Traditional warmth |
| Rice | ★★★☆☆ | Light | Neutral | Smooth | Short-term relief |
| Lupin | ★★★★★ | Medium | Very mild | Soft & plush | Long-lasting, allergy-friendly comfort |
If you’d like a deeper look at how these grains conduct heat, here’s a short study on how heat packs increase tissue temperature.
Choosing consciously — sustainable and local
At Sabine & Sparrow, we fill every heat pack with Australian-grown grains and wrap them in natural cotton fabrics.
It’s our way of keeping self-care kind — for you and the planet.
You can learn more about our sourcing and handmade process on our About Us page.
For more insight into sustainable sourcing of wheat, rice and lupin for wellness products, this resource explores the impact of local grain production on wellbeing.
Final thoughts
There’s no one “best” filling — only what’s best for you.
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Go for wheat if you love familiar warmth and comfort.
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Choose rice if you prefer something light and scent-free.
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Try lupin for the longest-lasting heat and allergy-friendly softness.
Whichever you choose, your heat pack becomes part of your self-care ritual — a moment to slow down, breathe, and feel good.
Ready to find your favourite? Explore our Handmade Heat Pack Collection, designed and made right here in Melbourne.
❓ FAQs
What is the best filling for heat packs?
It depends on what you want. Wheat is traditional, rice is light and neutral, and lupin stays warm longest — all-natural and soothing.
How long do heat packs stay warm?
Most stay warm for around 30–45 minutes. Lupin tends to last the longest before cooling down.
Are lupin heat packs hypoallergenic?
Yes. Lupin is naturally hypoallergenic and odourless, perfect for sensitive skin or people who can’t use wheat or rice.
Can I mix fillings?
It’s not recommended. Each grain absorbs and releases heat differently, which can cause uneven warmth.
What’s the safest way to heat them?
Always microwave your pack for 1–2 minutes. Check halfway, and never reheat immediately after use.
You can also review this guide on the optimal heating pad temperature for efficacy.
