Free buying tool
Contact lens case size finder
Confirm that you use daily disposables, store only sealed packs, and compared your current packs with product photos. Then answer two planning prompts for a starting size based on current Amazon-listed ranges. The tool runs entirely in your browser.
Find your case size
Complete both product checks, then answer two planning questions for a starting point. Your planning answers stay in your browser. We count the starting size shown and, if you choose Amazon, the destination size as aggregate events.
Choose the number of calendar days you want represented. This tool does not calculate your prescribed lens quantity.
Compare footprint and planned supply together.
No size selected yet
Complete both product checks and prompts
Confirm that you use daily disposables and will store only sealed, unopened packs. Then affirm that you compared your current packs with product photos, choose a supply window and routine, and request a starting size. No named result or Amazon product link appears before those steps.
What size contact lens case do you need?
Choosing an organizer size starts with how many days of unopened daily-disposable packs you want staged at once. A short travel supply and a longer at-home supply create different capacity and footprint priorities, even when the lens prescription is the same.
Start with your desired supply window. The finder maps that answer to the Amazon-listed range for each size. It does not measure your packs or promise that the listed day count will fit a particular brand or package generation.
The second factor is where you plan to keep the organizer, which affects how much footprint you can accept. The third factor is pack shape. Blister packs can change between brands and package generations. Compare your unopened packs with current listing photos, and treat the finder as a starting point rather than a fit guarantee.
| Size | Amazon-listed range | Starting use |
|---|---|---|
| Small | Amazon lists up to 30 days | The smallest Sturdysight organizer. Actual capacity varies with unopened pack shape. |
| Medium | Amazon lists up to 40 days | More room than Small. Actual capacity varies with unopened pack shape. |
| Large | Amazon lists up to 90 days | The highest Amazon-listed range. Actual capacity varies with unopened pack shape. |
How much supply fits in the paired L/R setup
The honest answer depends on the shape of your unopened blister packs. Amazon lists Small for up to 30 days, Medium for up to 40 days, and Large for up to 90 days. The Amazon Small page currently contains conflicting fit language: all-brand wording alongside a sizing section that names Acuvue, Precision1, and BioTrue and says other brands are still being tested. Use the day counts as capacity guides; Sturdysight fits all brands of daily-disposable blister packs.
The finder uses those listing ranges to suggest a starting size for the number of days you want to stage. It does not measure or adjust for blister-pack shape. Compare your current unopened packs with the Amazon photos before choosing a size, and choose more room only when that comparison supports it.
Amazon lists every Sturdysight size as a paired set of two eye-specific cases, one labeled L and one labeled R. The listed day range describes that paired setup and does not double. Review the current product photos and order details before choosing a size.
If you wear reusable lenses, use the case supplied or specified by the prescribed care system. Sturdysight is designed only for unopened daily-disposable blister packs. Do not use it for a reusable lens, a bare spare lens, or solution.
Small vs Medium vs Large, in plain terms
Small is the smallest organizer, Medium provides more room, and Large has the highest Amazon-listed range. Compare the listing ranges and your unopened blister packs with current product photos. The finder narrows the choice, but it does not certify every brand or package generation.
Bigger is not automatically better. Large uses more space, while Small offers less room. Compare the footprint and Amazon-listed range, then compare your current unopened packs with the product photos. The finder provides a starting point, not a physical fit result.
The current listings show each size as a paired set of two hard plastic cases, one labeled L and one labeled R. They distinguish the products by the listed range for the paired setup. Decide how much supply you want to stage, compare your pack shape with current photos, and use the finder only as a starting point.
Five sizing mistakes to avoid
These checks reduce avoidable sizing mistakes, but they do not replace comparing your unopened packs with the product photos.
Buying the biggest case by default
Large has the highest Amazon-listed range, but that does not make it the right fit for every pack or routine. Compare planned supply, pack shape, and current product photos.
Sizing for lenses you do not stage
For daily disposables, compare the supply you plan to stage with current listing ranges. Leave deeper backup cartons in their original packaging.
Misreading the paired L/R set
Amazon lists a paired set of two eye-specific cases, one labeled L and one labeled R. The day range describes that paired setup and does not double.
Ignoring pack shape
Unopened blister packs vary in shape by brand and package generation. Compare your packs with the Amazon product photos before ordering. A larger size provides more room, but it is not a universal fit guarantee.
Confusing a staging case with a soaking case
Sturdysight organizes only sealed daily-disposable packs. Removed reusable lenses belong in the case supplied or specified by the prescribed care system. Never put a bare lens or solution in this organizer.
Sizing for travel and on the go
Travel can make footprint more important, but it does not prove which organizer fits your packs. The finder compares trip supply with current listing ranges and treats Small as the most compact option. Check your unopened packs against current product photos before ordering.
Amazon lists each size as a paired L/R set, not as two complete travel kits. For a longer trip, Amazon lists Medium for up to 40 days for the paired setup, but actual capacity depends on blister-pack shape. Compare your unopened packs with the product photos before relying on that range.
TSA lists contact lenses as permitted in carry-on and checked bags. Contact lens solution is also permitted, but TSA recommends putting containers over 3.4 ounces in checked baggage. Larger medically necessary liquids must be declared for inspection. Check the current TSA guidance before you fly.
Frequently asked questions
What size contact lens case do I need?
Start with how many days of unopened daily disposable packs you want to stage in one organizer. Amazon lists Small for up to 30 days, Medium for up to 40 days, and Large for up to 90 days. Actual capacity depends on pack shape. Compare your packs with the product photos before ordering.
How many contact lenses fit in a case?
It depends on size and pack shape. Amazon lists Small for up to 30 days, Medium for up to 40 days, and Large for up to 90 days for the paired setup. Each set has two eye-specific cases, one labeled L and one labeled R. Those are listing capacities, not universal guarantees.
What is the difference between small, medium, and large contact lens cases?
The difference is listed capacity and footprint. Small is the most compact, Medium provides more room, and Large is the largest option. Each size is a paired set of two eye-specific cases, one labeled L and one labeled R. The day range describes the paired setup, and actual capacity varies with pack shape.
Should I size up or size down if I am between sizes?
Review the larger size when you want more room, but do not treat sizing up as a fit guarantee. Compare the listing range and current product photos with your unopened packs. The finder provides a starting point, not a physical fit test or safety determination.
Which case size is best for travel?
Small is the smallest Sturdysight organizer, but trip length alone does not prove pack fit. Compare your planned supply and unopened pack shape with current product photos. Sturdysight fits all brands; compare pack shape and planned supply to choose the right capacity.
Does case size matter for monthly or bi-weekly lenses?
Sturdysight is built only for unopened daily-disposable blister packs. Removed reusable lenses belong in the case supplied or specified by the prescribed care system. Never put a bare reusable lens or solution in this organizer.
How does the case size finder work?
You confirm unopened daily-disposable use and a current product-photo comparison, then answer two planning questions about staged supply and use. The tool maps those answers to the Amazon listing capacities and gives you a starting point with a size-specific buy link. Your planning answers stay in the browser. The site counts the starting product size shown as an aggregate completion event. If you choose Amazon, it records only the source path, destination size, ASIN, and a normalized CTA placement.
Is a bigger contact lens case worth it?
Compare Large when you want the highest Amazon-listed capacity. Bigger is not automatically better because a larger organizer takes more space. Use the finder as a starting point, then compare your unopened packs with the product photos before ordering.