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Updated: 2026-10-02 · 7 min read · Independent comparison
Both are "case only" accessories — neither one includes earbuds, and neither one is a universal fit. That single fact decides most of this comparison before anything else does. These are two different shapes of protection aimed at two different sets of cheap TWS earbuds.
• RLSOCO's biggest strength: a hard EVA-and-polyester shell rated water resistant, built to absorb knocks, shock and scratches — plus a two-year warranty on manufacturing defects.
• RLSOCO's biggest trade-off: it's a bulkier, structured enclosure, so it adds real volume in a pocket compared to a thin sleeve.
• FJIASTB's biggest strength: soft, skin-friendly silicone with an integrated flip cover that won't pop off, and it ships with both a keychain and a wrist strap.
• FJIASTB's biggest trade-off: soft shell protection only, and it fits the Moondrop Pudding TWS case specifically — nothing else.
• Choose RLSOCO if you carry JBL Live Free 2 or Wave 300 TWS and want maximum drop-and-crush protection.
• Choose FJIASTB if you own Moondrop Pudding TWS earbuds and want the lightest possible add-on with a carrying strap included.
The RLSOCO case is a hard-shell enclosure made from polyester fabric over high-density EVA. That material combination is the whole story here. EVA is the same family of foam used in structured travel cases, and RLSOCO states it uses a higher-grade thickness of EVA specifically so the case doesn't deform easily over time. In practice, that means the shell holds its shape instead of collapsing when something heavy lands on top of it in a bag.
The protection claims are straightforward: knocks, shock and scratches, plus water and dust resistance. The water resistance level is listed as "water resistant" rather than waterproof — worth noting, because it means splashes and light rain are fine, but you shouldn't dunk it. The interior is designed to hold the charging case securely, and the listing is explicit that this is case only — the JBL earbuds and charging case are not included.
RLSOCO also leans into materials transparency in a way that's unusual at this end of the market: the fabric, lining and EVA compartments are described as certified to RoHS and SGS standards, and the product carries a two-year warranty covering manufacturing defects. For a cheap accessory, that's a meaningful signal about how the brand expects the case to hold up.
Who should skip it: if you own anything other than JBL Live Free 2 or Wave 300 TWS, this case won't fit — compatibility is narrow and specific. Skip it too if you want the absolute slimmest possible sleeve; a structured EVA shell is not that.
FJIASTB Case: Who It's For
The FJIASTB case takes the opposite approach. It's soft silicone in a dark green finish with a nature-inspired pattern, and the design goal is clearly minimal bulk and a pleasant feel in the hand. Silicone is skin-friendly and, per the listing, harmless — a fair point if the case lives in your pocket next to your phone all day.
The standout design detail is the integrated construction: the flip cover is built as one piece rather than a separate lid, so it won't accidentally fall off. Anyone who's owned a two-piece silicone sleeve knows exactly why that matters — those lids have a habit of separating at the worst moment. FJIASTB also emphasizes that you can charge without removing the case, which is the feature that makes a silicone cover genuinely usable day to day rather than something you peel off and lose.
The package includes the case, a keychain and a wrist strap. That's a small thing, but it means the case is carry-ready out of the box — clip it to a bag, loop it on a wrist, done. The form factor is described as slim fit and travel compatible, and the material is listed as waterproof and shockproof. The shell type is soft, so read that as cushioning against bumps and scuffs rather than armor against a hard drop.
Who should buy it: Moondrop Pudding TWS owners who want a lightweight, grippy cover that stays on, charges through, and comes with a strap. It's also the better pick if color and feel matter to you — dark green silicone with a nature pattern is a style choice, not just a utility purchase.
Side-by-Side: Which Should You Choose?
• Best for hard-shell protection → RLSOCO Case. High-density EVA and polyester resist knocks, shock and scratches in a way soft silicone simply doesn't.
• Best for a slim, low-profile feel → FJIASTB Case. Soft silicone adds minimal bulk and is described as slim fit.
• Best for included carrying hardware → FJIASTB Case. You get a keychain and a wrist strap in the box, not just a carabiner.
• Best for long-term durability confidence → RLSOCO Case. A two-year warranty on manufacturing defects and RoHS/SGS-certified materials are concrete durability signals.
• Best for charging without removal → FJIASTB Case. The design is explicitly built so you charge without disassembling the cover.
• Best for color and finish choice → FJIASTB Case. Dark green silicone with a nature pattern; RLSOCO is a functional fabric-and-EVA shell.
• Best for bag-and-backpack carry → RLSOCO Case. Water resistant, dust resistant and structured enough to survive a commute at the bottom of a bag.
• Best for JBL Live Free 2 / Wave 300 TWS owners → RLSOCO Case. Best for Moondrop Pudding TWS owners → FJIASTB Case. Compatibility, not preference, is the deciding factor.
If I owned JBL Live Free 2 or Wave 300 TWS earbuds, I'd buy the RLSOCO case. In my opinion the hard EVA shell, the water and dust resistance, the certified materials and the two-year warranty make it the more protective and more confidence-inspiring pick for a cheap pair of earbuds you still don't want wrecked. If I owned Moondrop Pudding TWS earbuds instead, I'd buy the FJIASTB case without hesitation — soft, slim, charges in place, and it arrives with both a keychain and a wrist strap. My honest advice: match the case to your exact earbuds first, then decide how much armor you actually want. Before you commit, check the current price on Amazon — the page button below takes you there.
what is tws earbuds
TWS stands for "true wireless stereo" — earbuds that have no wire between the left and right bud. Each earbud connects independently, usually to a charging case that also stores and recharges them. That charging case is exactly what both the RLSOCO and FJIASTB products are designed to cover.
what is tws earbuds means
In plain terms, it means the two earbuds are fully separate from each other — no cable running behind your neck. The "true" part distinguishes them from older "wireless" buds that still had a connecting wire. Because the charging case is small and easy to scuff, protective covers like these two are a common add-on.
how much is tws earbuds
It varies enormously by brand, from budget models to premium flagship sets, and the same is true of the cases that protect them. Prices change often, so I don't quote numbers here — check the current price on Amazon using the button on this page for an up-to-date figure.
how to tws earbuds
Pairing is usually the same across brands: take the earbuds out of the charging case and they power on and enter pairing mode automatically, then select them in your phone's Bluetooth settings. Fit matters more than most people expect — swapping to a different ear tip size often fixes both comfort and sound quality.
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