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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-07 · 6 min read · Independent comparison
• BLLQ Memory Foam Ear — biggest strength: slow-rebound memory foam tips in three sizes (S/M/L) that are designed to block distractions and boost bass, and they stay on the buds inside the charge case.
• BLLQ Memory Foam Ear — biggest trade-off: it is not a pair of earbuds. It is a set of replacement tips only, and it fits specific Soundcore models.
• CaseSack GravaStar Sirius Pro — biggest strength: a semi-hard, shock-absorbing PEVA shell with an elastic strap and mesh pocket that keeps earbuds and a cable organized.
• CaseSack GravaStar Sirius Pro — biggest trade-off: it is a case only. Your actual earbuds and charging cable are not included.
• Who BLLQ is for: Soundcore owners who want a comfier, quieter fit for long study sessions.
• Who CaseSack is for: GravaStar Sirius Pro owners who want a compact, travel-ready way to protect their buds.
This is a consumable upgrade, not a gadget. The BLLQ Memory Foam Ear is a pack of six memory foam ear tips — three pairs, one pair each in small, medium and large — made in white memory foam and sized at 4 x 3 x 0.4 inches. It is built for people who already own Soundcore TWS earbuds and want to change how they feel and seal.
The compatibility list is specific: Soundcore Liberty 3 Pro, Liberty 4, Life P2, Life P3 and Space A40, plus other Soundcore true-wireless models. The point of the foam is isolation. Foam expands to fill the ear canal more completely than a stock silicone tip, which is exactly why this design is pitched at blocking distractions and enhancing bass. If you study in a noisy house, a library with chatter, or on a commute where engine drone eats your focus, that extra seal is the whole reason to buy.
Comfort is the second argument. Memory foam is soft and slow-rebounding, and the stated goal is all-day wear without the soreness that firmer tips can cause. There is also a detail I actually like: the tips are shaped to fit inside the charge case, so you do not have to peel them off every time you dock the buds. That sounds small until you have done it nightly for a month.
Who should skip it? Anyone who does not own a compatible Soundcore model, and anyone expecting a full earbud. This package is foam tips only — no earphones, no case. If you want to compare it against a case-style accessory, note that these two products do entirely different jobs.
The CaseSack is a black semi-hard zipper case with an EVA enclosure, listed at 3.5 x 2.5 x 2 inches and weighing 1.7 ounces. It is made for the GravaStar Sirius Pro Earbuds 5.2 TWS RGB earphones, and the interior is lined and antistatic to guard against minor bumps, shakes and scratches. The PEVA materials are described as pressure- and hit-absorbing and water resistant.
The useful part is the organization. An elastic strap holds the device against the base so it does not rattle around, and a mesh pocket in the lid takes a charge cable or other small accessories. That is a genuinely thoughtful layout for a pouch this size — it turns a loose pair of buds and a cable into one grab-and-go bundle.
It is a lifestyle case, not a technical one. It fits a purse, shoulder bag or suitcase, and it works as well for home storage as for travel. If you keep earbuds in a backpack, this is the difference between pulling out a scratched, tangled set and pulling out something intact.
Skip it if you own a different earbud model, or if you are shopping for sound. This is protection and transport only. The package contains the case alone — no device, no accessories. And if you are weighing it against foam tips, the honest answer is that they compete for the same wallet but not for the same need.
Side-by-Side: Which Should You Choose?
• Best for studying in noisy places → BLLQ Memory Foam Ear. The memory foam seal is designed to block distractions and sharpen bass, which helps you stay locked in.
• Best for keeping buds clean and protected → CaseSack GravaStar Sirius Pro. The semi-hard EVA shell and lined interior handle shock, shake and scratches.
• Best for travel and commuting → CaseSack GravaStar Sirius Pro. Lightweight, compact, water resistant, and it slides into a bag without adding bulk.
• Best for cable and accessory organization → CaseSack GravaStar Sirius Pro. The elastic strap plus lid mesh pocket is the standout feature.
• Best for a quick, low-effort upgrade → BLLQ Memory Foam Ear. No new device to learn, and the tips stay on when you charge.
• Best if you already own Soundcore buds → BLLQ Memory Foam Ear. The compatibility list is explicit and includes the popular Life and Liberty lines.
• Best if you own GravaStar Sirius Pro → CaseSack GravaStar Sirius Pro. Fit is the whole point of a case, and this one is matched to that model.
If your goal is to study better with the earbuds you already own, I would buy the BLLQ Memory Foam Ear. In my opinion, a better seal and softer foam deliver the more useful change for a student — quieter surroundings, more bass, less ear fatigue — and the three-size pack lets you find your fit. If instead you own GravaStar Sirius Pro earbuds and your problem is protecting them on the move, the CaseSack is the smarter pick. Two good products, two completely different jobs. Check the current price on Amazon before you commit to either.
FAQ
what is tws earbuds
what is tws earbuds means
It means the left and right earbuds connect to each other wirelessly and each has its own driver, with no cable running between them. That is why accessories like replacement foam tips and a fitted carry case matter — there is no cord to hold things together.
how much is tws earbuds
Neither item on this page is a pair of earbuds. The BLLQ pack contains six foam ear tips in three sizes, and the CaseSack package contains one carrying case. For the current price of either, check the listing on Amazon.
how to tws earbuds
Pairing usually means taking both buds out of the case and connecting them to your phone over Bluetooth. With the BLLQ tips, fit them onto your Soundcore buds in the size that seals best — they are shaped to stay on inside the charge case, so you do not need to remove them to recharge.
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