How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-05 · 6 min read · Independent comparison
• AZLA SednaEarfit Crystal — biggest strength: hypoallergenic German LSR silicone with a naturally grippy surface and an acoustic seal that holds buds in place during workouts.
• AZLA SednaEarfit Crystal — biggest trade-off: it's a set of replacement tips, not a case, and it's only compatible with specific earbuds (not Galaxy Buds Pro, Buds Live, or AirPods Pro).
• Alltravel TWS Earbuds Case — biggest strength: a semi-hard, water-resistant PEVA shell sized specifically for JBL Endurance Peak 3, Peak 2, and Peak TWS earbuds.
• Alltravel TWS Earbuds Case — biggest trade-off: it protects the charging case, not your ears — it does nothing for fit, grip, or sound.
• Who each is for: AZLA is for anyone whose cheap TWS earbuds keep slipping out mid-run; Alltravel is for anyone who wants to stop losing or scratching their JBL charging case in a gym bag.
The SednaEarfit Crystal is a set of replacement earbud tips, and it solves the single most common frustration with cheap TWS earbuds: they don't stay in. The material matters here. AZLA uses hypoallergenic German LSR (liquid silicone rubber), which has a naturally tacky surface — not sticky in a gummy way, but grippy enough that the tip resists sliding out of your ear canal when you sweat. That's the whole reason I'd point a runner toward these. If you've ever had a bud pop loose at mile two and bounce onto the pavement, the grippy LSR surface is the fix.
The second benefit is the acoustic seal. A proper seal doesn't just block outside noise; it also gives the driver something to push against, which is why a good tip fit often makes budget earbuds sound noticeably fuller. AZLA claims the design improves passive isolation without altering the original sound signature — meaning it doesn't color the tuning, it just removes the leakage that was muddying it. For a cheap pair of earbuds, that's meaningful.
Sizing is where AZLA did real homework. The tips are offered in multiple sizes based on analysis of more than 1,500 ear shapes over two years, and the lineup includes ML, MS, SS, and SSS options. The 4mm ultra-short eartip core fits a wide range of TWS Bluetooth earbuds, and the tips also work as IEM ear tips on compatible nozzles. Compatibility leans toward Beats Powerbeats Pro and Powerbeats Pro 2 (with charging case compatibility maintained), plus Galaxy Buds 2, Buds, and Buds+, and many other popular wireless earbuds. It is explicitly not compatible with Galaxy Buds Pro, Galaxy Buds Live, or AirPods Pro.
Alltravel TWS Earbuds Case: Who It's For
The Alltravel case is a different kind of solution entirely. It's a palm-sized, semi-hard carrying case built specifically around the JBL Endurance Peak 3, Peak 2, and Peak True Wireless earbuds. The outer shell is PEVA — a water-resistant material that absorbs pressure and impacts — and the interior has a size-matched base with an elastic strap to hold the charging case in place, plus a mesh pocket for the charging cord and small accessories. That mesh pocket is the detail I appreciate most. Loose cables in a bag are how charging ports get scratched, and keeping the cord separated from the case prevents exactly that.
At 4.5 x 3.25 x 1.5 inches and 1.8 ounces, it's genuinely compact and light — the kind of thing you toss in a backpack or gym bag without thinking about it. It comes with a carabiner, so you can clip it to a strap or belt loop, and the white striped silicone finish gives it a clean look. The one-year warranty is a reasonable reassurance given the simple construction.
Who should buy it? Anyone who owns JBL Endurance Peak earbuds and wants a dedicated, organized home for the charging case and cable. It's ideal for the gym-bag reality of keys, water bottles, and loose gear. Who should skip it? Anyone who doesn't own one of those JBL models — the fit is specific and the case won't do much for a different brand. And note: this is the protective case only. The earbuds and accessories are sold separately, so you're buying storage, not hardware.
• Best for keeping cheap TWS earbuds from falling out on a run → AZLA SednaEarfit Crystal. The grippy LSR surface and acoustic seal are exactly what active use demands.
• Best for protecting and organizing your JBL Endurance Peak charging case → Alltravel TWS Earbuds Case. The semi-hard PEVA shell and elastic strap are purpose-built for it.
• Best for sound quality gains on a budget → AZLA SednaEarfit Crystal. A proper seal reduces leakage, which lets budget drivers perform closer to their potential.
• Best for travel and gym-bag carrying → Alltravel TWS Earbuds Case. Palm-sized, light, water-resistant, with a carabiner and a mesh pocket for the cord.
• Best for sensitive ears → AZLA SednaEarfit Crystal. Hypoallergenic German LSR silicone is chosen specifically for comfort over long sessions.
• Best for JBL Endurance Peak owners specifically → Alltravel TWS Earbuds Case. It's sized and matched for those models and nothing else.
• Best for broad earbud compatibility → AZLA SednaEarfit Crystal. It fits Beats Powerbeats Pro models, Galaxy Buds 2/Buds/Buds+, and many other TWS earbuds.
• Best if your earbuds already fit well → neither. Save your money unless you have a slipping problem or a storage problem.
In my opinion, if you're running with cheap TWS earbuds, buy the AZLA SednaEarfit Crystal first. Fit is the bottleneck on almost every budget pair, and a grippy, properly sealed tip fixes both the staying-in problem and a chunk of the sound problem at once. I'd only steer you to the Alltravel TWS Earbuds Case if you own JBL Endurance Peak 3, Peak 2, or Peak earbuds and your real pain is a lost or scratched charging case. The two products barely compete — one fixes your ears, the other fixes your bag. For the "for running" use case specifically, the tips are the higher-impact purchase.
TWS stands for "true wireless stereo" — earbuds with no cable between the left and right pieces. Each bud connects independently, usually to a charging case that doubles as a power bank. The AZLA SednaEarfit Crystal is designed as replacement tips for TWS earbuds like Galaxy Buds and Beats Powerbeats Pro.
It means the two earbuds are truly wireless — no neckband, no wire joining them. That freedom is great for running, but it also means each bud can slip out independently, which is why grippy replacement tips like the SednaEarfit Crystal matter for active use.
That varies enormously by brand and model, and this page doesn't quote prices. Both products here are accessories rather than earbuds themselves — one is a tip set, one is a storage case. For current pricing, use the "Check latest price on Amazon" button on this page.
Pairing is usually straightforward: take both buds out of the case, enable Bluetooth on your phone, and select the earbuds from the list. For fit, the more important step is choosing the right tip size — AZLA offers ML, MS, SS, and SSS sizes based on analysis of over 1,500 ear shapes, so you can dial in a seal that holds during workouts.
As an Amazon Associate I earn from qualifying purchases.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.
When you buy through links on this page, we may earn a commission from qualifying purchases at no extra cost to you.
Amazon and the Amazon logo are trademarks of Amazon or its affiliates. This site is an independent third-party review and is not affiliated with, endorsed by, or sponsored by Amazon or the product brands mentioned.
See also: Wigfar Open Ear Headphones vs Raycon Essential Open Ear, Yistao Bone Conduction Headphones vs AOLBSPD Ear Buds Air, havit Open Ear Headphones vs SVJEFY Single Bluetooth5.4, how RAOPINGX Earbuds compares to Matast Earbuds 2026