I tested a few by filling them with water and leaving them on their side and upside down for a day and nothing leaked. BUT when I put gel polish in them and traveled with them (the reason I bought them) they leaked all over and made a big mess.
Segbeauty 25.4Oz Shampoo Conditioner Bottles, 3Pcs 750Ml Pump Press Dispenser Set With Labels, Empty Refillable Shampoo Body Soap Conditioner Gel Plastic Lotion Containers For Bathroom Hotel White
33 Review
Refillable Hand Soap Dispenser Set - 2Pcs 10.1Oz Press Pump Bottles For Home & Hotel Use
33 Review
ZEJIA 100Pcs Blue Makeup Sample Jars With Lids - 5 Gram Cosmetic Containers For Easy Storage
28 Review
24-Pack Amber 2ML Essential Oil Roller Bottles By ZEJIA With Stainless Steel Roller Balls And 2 Droppers - Mini Glass Roll-On Bottles For Oils
26 Review
3Pcs Crystal Clear Cosmetic Bag TSA Air Travel Toiletry Bag Set With Zipper Vinyl PVC Make-Up Pouch Handle Straps For Women Men, Roybens Waterproof Packing Organizer Storage Diaper Pencil Bags
37 Review
Toiletry Bag, VAGREEZ Upgraded Large Hanging Travel Toiletry Organizer Kit With Heavy-Duty Zippers Waterproof Comestic Bag Dop Kit For Women Men
37 Review
Leopard Narwey Hanging Travel Toiletry Bag: Waterproof Cosmetic Make Up Organizer For Women & Girls
37 Review
Travel Toiletry Bag Organizer For Men And Women - Medium-Sized Hanging Makeup And Cosmetic Bag In Pink By Narwey
35 Review