Quick answer
Fit is decided by your cup body, not the straw. If you own a KeepCup Glass Cup, choose the https://keepcupecj.com/products/boba-straw-lid-for-glass-cup-305362https://keepcupecj.com/products/boba-straw-305358https://keepcupecj.com/products/boba-straw-305359Boba Straw Lid for Glass Cup; if you own a KeepCup Steel Cup, choose the Boba Straw Lid for Steel Cup. The two lids are sold as separate SKUs, and the catalog does not list a single lid that fits both materials. Buy the lid that matches the cup you already have, then check the current price difference between the two.
Boba Straw Lid for Steel Cup
Why the cup material decides the lid
A reusable cup straw lid has to grip the rim it was made for. The Boba Straw Lid for Steel Cup and the Boba Straw Lid for Glass Cup are listed as separate products in the Accessories category, so the safest assumption is that each one is shaped for its matching cup body. The glass version is described as compatible with KeepCup Glass Cups for a secure fit, with a straw opening for boba and other straw-friendly drinks. The steel version is described by a customer as a spare straw lid that converted a hot drink cup for iced lattes, with interchangeable lids.
That difference matters because a lid that is slightly loose will not seal around a straw, and a lid that is too tight can be hard to press on and off. Neither listing states a universal fit, so treat the material match as the first filter before you look at price or color.
What you actually get with each lid
The glass version is positioned as a practical accessory for boba, smoothies, or iced drinks, with a straw opening and easy cleaning for everyday use. The steel version is positioned as a spare part: a way to keep using a cup you already own rather than replace the whole cup. If your goal is to add boba capability to an existing cup, both do the same job on their own cup body.
One honest limitation: the catalog does not list the exact rim diameter, straw hole size, or material of either lid. If you are matching a lid to a cup from another brand, you cannot confirm fit from these listings alone. Stay with the KeepCup cup you already own, or measure your rim and compare before ordering.
Price and value at a glance
The Boba Straw Lid for Glass Cup is listed at USD 11.52 against a comparison price of USD 18.00. The Boba Straw Lid for Steel Cup is listed at USD 14.20 against a comparison price of USD 20.00. The steel lid costs more in the current catalog, which is worth knowing if you are buying for two different cups and want to spread the spend.
Price should not override fit. A cheaper lid for the wrong cup body is not a saving, because you will still need the correct lid to use the cup. Check the lid that matches your cup first, then decide whether the difference matters to you.
How to confirm your cup before ordering
Look at the cup you plan to use. If the body is glass with a cork sleeve, the glass lid is the match. If the body is steel, the steel lid is the match. If you are unsure which KeepCup you own, check the base or the original product page rather than guessing from a photo.
If you are buying a lid as a gift, ask which cup the person uses. A boba straw lid is a small accessory, but the wrong material version is a return waiting to happen. When in doubt, the cup owner can tell you in one question: glass or steel?
Trade-offs to weigh before you buy
- Glass lid: lower price, glass-only fit: The Boba Straw Lid for Glass Cup is listed at USD 11.52 and is described as compatible with KeepCup Glass Cups for a secure fit. It is the cheaper of the two lids in the current catalog. Best value if you already own a glass cup and want boba capability.
- Steel lid: higher price, steel-only fit: The Boba Straw Lid for Steel Cup is listed at USD 14.20 and is described as a spare lid that converts a hot drink cup for iced lattes, with interchangeable lids. Best if your cup body is steel and you want to keep using it for cold drinks.
- No universal fit stated: Neither listing claims to fit both materials, and neither lists rim diameter or straw hole size. You cannot confirm cross-material fit from the catalog alone. Match the lid to your cup material, or measure your rim before ordering.
Product facts
- Boba Straw Lid for Glass Cup: Compatible with KeepCup Glass Cups for a secure fit, with a straw opening for boba and other straw-friendly drinks, and easy to clean for everyday use. This is the lid to choose if your cup body is glass, and the straw opening is the feature that makes boba and smoothies practical on the go.
- Boba Straw Lid for Steel Cup: Described by a customer as a spare straw lid that converted a hot drink cup for iced lattes, with interchangeable lids. This is the lid to choose if your cup body is steel, and it lets you repurpose a cup you already own instead of buying a new one.
- Brew Cork Glass Cup: A 6oz Brew Cork Glass Cup described as an excellent size for a small Flat White or other beverages. If you are pairing a glass boba lid with a small glass cup, this size is a realistic match for a compact iced drink.
Which lid should you choose?
Choose this if
- You own a KeepCup Glass Cup and want to drink boba, smoothies, or iced drinks with a straw.
- You own a KeepCup Steel Cup and want to convert it for iced lattes or other cold drinks.
- You are replacing a lost or damaged lid on a cup you already use.
Skip this if
- You want one lid that fits both glass and steel cups; the catalog lists them as separate products.
- You are trying to fit a cup from another brand and cannot confirm the rim size.
- You do not use straws and prefer a standard lid for hot drinks.
Check your cup body first, then order the matching lid: glass lid for glass cups, steel lid for steel cups. If you are still unsure, measure your rim or ask the cup owner before you buy.
