Plastic Bottle Caps

About

Wholesale plastic bottle caps for small businesses and makers who need a reliable seal every time. Available in black and white, these PP caps fit a range of glass bottle sizes — from your smallest 10 ml vials up to full 16 oz Boston rounds . Compatible with our glass bottles , including Boston round , syrup , packer , and euro bottle styles. If you need a cap that pairs with our 10 ml roll-on bottles, we've got those covered too. Boston Round and Packer Bottle Caps Boston round and packer bottles are workhorses — used for oils, serums, tinctures, supplements, and anything that needs a clean, secure screw top. These caps thread on consistently and hold through shipping. No fussing with fit. Syrup and Euro Bottle Caps Syrup and euro bottle styles have their own neck specs, and these caps are sized to match. Whether you're filling cocktail mixers, herbal syrups, or apothecary blends, a cap that fits properly is just the start — the Polycone liner does the real sealing work. Browse the full range of closures at Caps & Closures . What Makes These Caps Work Polypropylene (PP) is the right material for screw caps. It's rigid enough to thread cleanly, light enough not to add unnecessary weight, and chemically stable across a wide range of contents — oils, water-based formulas, alcohol-based products, and more. The Polycone liner is what gives you the actual seal. It compresses against the bottle neck as you tighten, filling any small gaps and preventing leaks in transit. That matters when you're shipping a hundred units at a time and can't afford returns from leaky bottles. Available in classic black and white — both finish clean on the shelf and don't fight your label design. Who These Caps Are For Plastic bottle caps aren't a one-industry product. Here's who typically orders from this collection: Skincare and cosmetics brands — face oils, serums, toners, body oils in Boston round and packer bottles Herbal and supplement makers — tinctures, liquid extracts, and supple