AKOAK Pack of 2 Push Down Empty Lockable Pump Dispenser Bottle for Nail Polish and Makeup Remover,200ml(6.8oz),Black Top Cap

I ordered this set to have a way to dip an acid brush in isopropyl alcohol, to clean soldered joints.With careful handling and use, these bottles do the job just fine.Kudos to other reviewers that outlined the very discreet locking system- were it not for their efforts, I’d probably be in the one to two star reviewers saying these bottles don’t work, they do.So, I’ve been carefully unscrewing the cap and filling one of the bottles with isopropyl alcohol, then carefully unlocking the pump WITH THE CAP ON, slowly pumping alcohol to the cap’s basin, then removing the cap to dip my brush. If I need more alcohol, I close the cap, and SLOWLY pump more up.When I’m done, I clean the cap basin, put the cap top down, and carefully lock, then test the pump to ensure it’s locked. If I didn’t lock it and more alcohol pumps up, I pop the top off, clean the alcohol, and try again. Once the pump is locked, I put the bottle away.Why a long drawn out story of my usage? To illustrate that again, with careful use and handling, these bottles work fine. If you get ham-fisted with them, they will break and be rendered useless as pump dispensers. Amazon had me sub-rate the bottles “For traveling”. I gave the bottles three stars. If you empty the bottles, and pack them carefully to keep them from shipping/travel handling abuse, I think they’d be okay. But the bottles aren’t durable, so if they can’t be packed with a lot of cushioning, I’d say go look for something more durable.On that note, I do wish Amazon would again evaluate the fragility of items they ship. I got lucky, my bottles arrived in a box with air bags, and some acid brushes I’d ordered, and the box hadn’t been damaged. But I’m willing to bet some reviewers here got bottles that weren’t defective, but got damaged in shipping.