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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-25 · 8 min read · Independent comparison
• Spigen Rugged Armor Designed — biggest strength: dual-layer TPU and PC construction with Air Cushion Tech, carbon-fiber accents, a pre-applied adhesive for secure fitment and a zinc alloy carabiner.
• Spigen Rugged Armor Designed — biggest trade-off: it is built only for the Bose Ultra Open Earbuds (2024), so it is useless if you own anything else, and it is a rigid, structured shell rather than a soft one.
• BOVUGAC Case — biggest strength: soft silicone that feels silky in the hand, a slim no-bulk profile, and a bundle that includes a keychain, cleaning pen and lanyard.
• BOVUGAC Case — biggest trade-off: it is made only for the Soundcore by Anker Space A40, it is explicitly not water resistant, and silicone offers less structural shock absorption than a hard shell.
• Who each pick is for: Spigen for Bose Ultra Open Earbuds owners who want a tough, grip-secured travel shell with precise cutouts; BOVUGAC for Soundcore Space A40 owners who want a lightweight, tactile cover with carry extras in the box.
The Spigen Rugged Armor Designed cover is a purpose-built shell for the Bose Ultra Open Earbuds charging case (2024 model). Its whole personality is structure. The enclosure is thermoplastic polyurethane, and the design pairs TPU with a PC layer plus Air Cushion Tech, which is Spigen's way of describing corner and edge geometry meant to absorb the initial shock of a drop. In practice, that means if your charging case lives loose in a backpack pocket, gets tossed on a desk, or rides on a carabiner clipped to a bag, this cover is designed to take the hit before your earbuds case does. The carbon-fiber accent gives it a sporty, technical look rather than a plain rubbery one, and the matte black finish keeps it understated.
Fitment is where this one earns its keep. Spigen pre-applies adhesive so the case mounts firmly and stays mounted, and it throws in an extra adhesive tape for additional support — a small but telling detail, because loose covers that slide off are the classic annoyance with earbuds case shells. The cutouts are precise, giving external access to the charging port, the pairing button and the power level indicator. That matters more than it sounds: if a cover blocks the pairing button or the charging port, you end up prying the whole thing off every time you need to do something basic. Spigen also includes a zinc alloy carabiner, which is a sturdier attachment point than the plastic clips you often see.
Who should buy it: Bose Ultra Open Earbuds owners who treat their charging case as something that travels — clipped to a bag, stuffed in a backpack, or carried in a pocket with keys and loose change. The hybrid travel-shell approach and drop protection are the point. Who should skip it: anyone who does not own the Bose Ultra Open Earbuds (2024), since compatibility is exclusive to that model. Also skip it if you specifically want a soft, grippy, stretchy cover — this is a structured shell, not a silicone skin, and that is a feel difference, not a flaw.
The BOVUGAC Case is the opposite philosophy: soft, slim and bundled. It is designed specifically for the Soundcore by Anker Space A40 Adaptive Active Noise Cancelling Wireless Earbuds — and, per the listing, it is not compatible with other devices. The enclosure is silicone, described as skin-friendly and harmless, with a silky hand feel and full protection from scratches, accidental drops, shocks and bumps without adding bulk. That "without adding any bulk" claim is the heart of the pitch. Silicone covers like this hug the charging case tightly and add almost nothing to its footprint, which is exactly what you want if the case already lives in a tight jeans pocket or a small pouch.
The package is unusually complete for a case cover. You get the case cover itself, a carabiner keychain, a cleaning pen and a lanyard. The keychain lets you fix the covered case to a handbag or backpack, the lanyard gives you a second carry option, and the cleaning pen is a genuinely useful extra for earbuds owners — silicone tips and mesh nozzles collect earwax and dust, and having a small tool for that in the same box is practical. BOVUGAC also notes that the earbuds themselves are not included, which is worth knowing so there is no confusion when the box arrives.
The honest trade-offs: silicone is soft, so it spreads impact rather than deflecting it the way a rigid, layered shell can, and the water resistance level is explicitly listed as not water resistant. It is also a slim-fit, soft-shell design with a nature-themed pattern style, so it reads casual and grippy rather than armored and technical. Who should buy it: Soundcore Space A40 owners who want a lightweight, tactile cover that disappears in the pocket, plus a ready-made carry-and-clean kit. Who should skip it: anyone with Bose Ultra Open Earbuds, anyone who wants hard-shell drop protection, and anyone who expects the cover itself to shrug off rain or spills.
• Best for Bose Ultra Open Earbuds (2024) → Spigen Rugged Armor Designed. Compatibility is exclusive, so this is the only option of the two that fits.
• Best for Soundcore by Anker Space A40 → BOVUGAC Case. Same logic in reverse; it will not fit anything else.
• Best for drop and impact protection → Spigen Rugged Armor Designed. The TPU and PC dual layer with Air Cushion Tech is built around absorbing shock, while the BOVUGAC is a soft silicone skin.
• Best for a slim, pocket-friendly feel → BOVUGAC Case. Silicone adds almost no bulk and feels silky in the hand.
• Best for staying put on the case → Spigen Rugged Armor Designed. The pre-applied adhesive plus the spare adhesive tape is a deliberate anti-slip design.
• Best for accessories in the box → BOVUGAC Case. Keychain, lanyard and cleaning pen all ship together; the Spigen includes a zinc alloy carabiner only.
• Best for unblocked everyday access → Spigen Rugged Armor Designed. Precise cutouts for the charging port, pairing button and power level mean you rarely need to remove it.
• Best for a casual, grippy, no-fuss cover → BOVUGAC Case. Soft, skin-friendly silicone with a nature-themed look.
• Best for wet or messy conditions → neither, strictly speaking. The BOVUGAC is listed as not water resistant, and the Spigen is a protective shell, not a waterproof one. Treat both as everyday protection.
In my opinion, the decision here is made for you before you even compare features, because these two covers fit different earbuds and never overlap. If you own the Bose Ultra Open Earbuds (2024), I would buy the Spigen Rugged Armor Designed — the dual-layer build, Air Cushion Tech, adhesive fitment and precise cutouts make it the more protective and more secure of the two, and the carbon-fiber accent gives it a look that does not embarrass you on a bag. If you own the Soundcore Space A40, I would buy the BOVUGAC Case — the soft silicone feel, slim profile and the included keychain, lanyard and cleaning pen make it the more practical everyday pick for that earbuds case. Price is the one variable neither spec sheet tells you, so check the current price on Amazon before you commit.
how to charge earbuds case
Open the case lid, connect the case to a power source using its charging cable, and let the case and earbuds charge together. With the Spigen Rugged Armor Designed cover, the charging port cutout means you can plug in without removing the cover. With the BOVUGAC Case, you simply plug into the exposed port on the silicone cover.
how to charge case without earbuds
You can charge the case on its own — just leave the earbuds out and connect the case to power. The case battery fills up the same way. Neither cover needs to come off to do this, since both leave the charging port accessible; the Spigen is the more convenient of the two here because its cutout is precision-made for that port.
how to charge jlab earbuds case
Neither cover in this comparison fits JLab earbuds — the Spigen Rugged Armor Designed is made only for the Bose Ultra Open Earbuds (2024), and the BOVUGAC Case is made only for the Soundcore by Anker Space A40. For JLab, follow JLab's own charging instructions and look for a cover listed specifically as compatible with your JLab model.
how to charge apple earbuds case
Apple earbuds cases charge with Apple's own cable and, on newer models, wirelessly — but again, neither cover here fits them. The Spigen fits Bose Ultra Open Earbuds and the BOVUGAC fits Soundcore Space A40, so if you want a protective cover for an Apple case, you need one designed for that specific model.
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See also: BOVUGAC Case vs Caykist Earbuds 96H: Charging Case Earbuds, ROCKSOCKI Kids vs DigiCharge Carry Case: Foldable on Ear, Flyoukki Personal FM Radio vs BOVKE Hard Carrying Case