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If you want a hard-shell, drop-resistant travel case built specifically for Bose QuietComfort Earbuds II and QuietComfort Ultra models, choose RLSOCO Carrying Case; if you need a slim, clear, flexible cover that protects your Technics EAH-AZ100 charging case without hiding its design, choose kwmobile Earphones Case. These two products solve different problems, and picking the wrong one mostly comes down to which earbuds you own.
• RLSOCO Carrying Case — biggest strength: A rigid EVA and fiber shell with water, dust, and scratch resistance, plus a two-year warranty. It's a full storage case, not a sleeve.
• RLSOCO Carrying Case — biggest trade-off: It only fits Bose QuietComfort Ultra (2nd Gen), QuietComfort Ultra, and QuietComfort Earbuds II charging cases. If you own anything else, it simply won't work.
• kwmobile Earphones Case — biggest strength: A crystal-clear TPU cover with anti-slip grip, tear resistance, and precise cutouts that keep the charging port and buttons accessible at all times.
• kwmobile Earphones Case — biggest trade-off: It's a thin protective skin, not a hard case. It guards against scratches and minor bumps, but it isn't built for serious crushing or drop protection.
• Who each pick is for: RLSOCO for Bose owners who carry their earbuds loose in a bag and want a proper protective box; kwmobile for Technics EAH-AZ100 owners who want day-to-day protection while keeping the original look of their charging case.
The RLSOCO case is a custom-molded storage box. It's made from fiber materials paired with high-density EVA, and the manufacturer states the fabric, lining, and EVA compartments are certified to RoHS and SGS standards. That matters more than it sounds: EVA cases from no-name sellers often arrive with a chemical smell that lingers for weeks. RLSOCO specifically claims its materials prevent that, and it uses a thicker grade of EVA so the shell doesn't deform easily under pressure.
What you get is genuine protection. The hard shell absorbs knocks, shock, and scratches, and it's rated water resistant and dust resistant. There's room for your earbuds, the charging case, a cable, and spare eartips, which turns it into a small kit rather than just a cover. It weighs roughly 0.05 kg, so it adds almost nothing to your bag, and the compact shape is designed to slip into a purse, pocket, backpack, or handbag. The maximum compatible device size is 6.6 centimeters, which lines up with the Bose charging cases it's built for.
Who should buy it: anyone with Bose QuietComfort Earbuds II, QuietComfort Ultra, or QuietComfort Ultra (2nd Gen) who tosses their earbuds into a backpack, gym bag, or carry-on and wants real peace of mind. The two-year warranty on manufacturing defects is a genuine bonus at this tier of accessory.
Who should skip it: if you own Technics, Sony, Apple, or any other brand of earbuds, this case will not fit — it's molded to one family of Bose charging cases. And if you want to see your charging case through the cover, this is the opposite approach: it's an opaque grey box. Buyers should check the current price on Amazon, since it's a case-only product and the earbuds are not included.
The kwmobile case is a completely different animal. It's a transparent TPU silicone cover made specifically for the Technics EAH-AZ100 charging case. You stretch it on, and it hugs the case snugly thanks to the flexible, elastic material. It's tear-resistant and anti-slip, so it grips surfaces instead of sliding off a nightstand, and it comes off just as easily when you want it gone.
The real selling point is the cutouts. The charging port and buttons stay fully accessible, which sounds obvious but is where cheap covers fail — you end up unpeeling the whole thing every time you need to charge. kwmobile designed around that. The TPU is impact-resistant and wear-resistant, so it handles the scratches, scuffs, and small drops of daily life. And because it's colorless, it highlights the original design of the charging case instead of hiding it. If you like how your EAH-AZ100 looks, this preserves that.
At 20 g and measuring about 3.15 x 1.57 x 1.18 inches, it's about as slim as protection gets. It disappears into your pocket.
Who should buy it: Technics EAH-AZ100 owners who want everyday defense against scratches and minor impacts without bulking up the case or covering its look. It fits the "Slim & Secure" brief the manufacturer describes.
Side-by-Side: Which Should You Choose?
• Best for drop and crush protection → RLSOCO Carrying Case. Hard EVA shell, shock and knock resistance, water and dust resistant.
• Best for keeping your original charging case visible → kwmobile Earphones Case. Colorless TPU that highlights the design underneath.
• Best for Bose QuietComfort Earbuds II / Ultra owners → RLSOCO Carrying Case. Custom-molded fit for those exact models.
• Best for Technics EAH-AZ100 owners → kwmobile Earphones Case. It's made for that one model and nothing else.
• Best for traveling with cable and spare eartips → RLSOCO Carrying Case. There's room for accessories, not just the earbuds.
• Best for all-day, in-pocket slimness → kwmobile Earphones Case. At 20 g it adds essentially nothing.
• Best for charging without removing the cover → kwmobile Earphones Case. Precise cutouts keep the port and buttons open.
• Best for long-term material confidence → RLSOCO Carrying Case. RoHS/SGS-certified materials and a two-year warranty.
For most people reading this, the deciding factor isn't quality — both are solid, honest accessories — it's which earbuds you own. If you have Bose QuietComfort Earbuds II or a QuietComfort Ultra model, I'd buy the RLSOCO Carrying Case. In my opinion, the hard shell, accessory room, certified materials, and two-year warranty make it the more complete product for anyone who actually travels with their earbuds. If you own the Technics EAH-AZ100 and want slim, clear, everyday protection that keeps the charging port usable, I'd pick the kwmobile case instead. Check the current price on Amazon for whichever one matches your earbuds before you commit.
FAQ
Yes. The manufacturer lists compatibility with Bose QuietComfort Ultra (2nd Gen), QuietComfort Ultra, and QuietComfort Earbuds II. It's a case-only product, so the earbuds and accessories are not included.
No. The kwmobile case is made specifically for the Technics EAH-AZ100. It's a molded TPU cover, so it won't stretch to fit other brands or models properly.
The RLSOCO case, by design. It's a hard EVA shell rated water and dust resistant, built to absorb knocks and shock. The kwmobile is a soft TPU cover that handles scratches, scuffs, and minor impacts but isn't meant for crushing or heavy drops.
Yes. The kwmobile cover has precise cutouts, so the charging port and buttons stay fully accessible. That's one of its main practical advantages over a full storage case.
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See also: BOVKE Hard Carrying Case vs eSynic Bass Boost Style, Bucephalus Earbuds vs RLSOCO Hard Case, DigiCharge Carry Case vs LORELEI Q60, LEFXMOPHY Case Cover Replacement vs Xmenha TWS