Question 1

Can I autoclave these bottles with the caps on?**

Accepted Answer

The borosilicate glass bottles are fully autoclavable. However, based on detailed user feedback, the blue polypropylene caps and silicone sealing rings may not withstand repeated autoclave cycles and can warp. For sterile storage, many users successfully autoclave the bottles alone and attach the sterile caps afterward, or source separate autoclavable caps.

Question 2

How secure are the caps against leaks?**

Accepted Answer

The vast majority of reviews praise the GL45 screw caps for creating an excellent, leak-proof seal—perfect for mixing, storing, or even gently shaking solutions. A small number of users have reported a rare cap with threading issues. Our packaging ensures each set is inspected, but we recommend checking the seal with water upon arrival.

Question 3

What are the main uses for these bottles? Are they only for labs?

Accepted Answer

Not at all! While designed as media bottles, our customers creatively use them everywhere. Social media is full of examples: home brewers for yeast starters, DIYers for homemade lotions and oils, plant enthusiasts for nutrient solutions, and even in organized kitchens for syrups and extracts. They're ideal for anyone needing clean, chemical-resistant, graduated storage.

Question 4

How is the packaging? Will the bottles arrive safely?**

Accepted Answer

This is one of our most complimented features. Each bottle is individually bubble-wrapped and securely packed in a sturdy box within the shipping box. Over hundreds of reviews, breakage in transit is exceptionally rare. You can order with confidence that your set will arrive intact.

Question 5

What if I need truly autoclavable caps?**

Accepted Answer

The bottles use a standard GL45 thread, which is a common laboratory size. If your application requires guaranteed autoclavability of the entire assembly, several users on forums like Reddit recommend purchasing separate PTFE-lined or solid PP caps from specialized lab suppliers. Our bottles are compatible, giving you the flexibility to upgrade the caps for heavy-duty use while enjoying the high-quality glass.

Irenare Media Storage Bottles Borosilicate Storage Glass Scientific Round Graduated Media Bottle with Blue Gl45 Screw Cap for Lab Water Reagent Liquids(1000 ml,8 Pcs)

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