An inner sleeve with a clearly documented same-brand pairing
I would choose Katana Inner when following the maker’s specified Katana or Cortex double-sleeving setup. The compatibility caveat is useful: Ultimate Guard notes that other sleeve brands can affect the result.
Choose it if
You use Katana or Cortex and want the intended inner layer.
Look elsewhere if
You need an opaque playing sleeve or a sealable inner.
The buying facts
| Pack contents | 100 clear inner sleeves |
|---|---|
| Sleeve dimensions | 64 × 89 mm |
| Opening | Top-loading |
| Maker-stated pairing | Optimized for Ultimate Guard Katana and Cortex |
| Reference SKU | UGD011337 |
Will it fit?
Manufacturer-statedThe maker lists 64 × 89 mm inners optimized for Katana and Cortex. Other brands may change compatibility. This is manufacturer-stated evidence, not an independent insertion test.
A documented pairing is a useful starting point
Many sleeve listings give only generic standard-size language. Naming the intended regular sleeve narrows the decision, though it does not guarantee every individual card and sleeve will behave identically.
I would preserve the pairing information when comparing storage. Even a same-brand box may have limits on the total cards, tokens, or accessories; the inner sleeve does not expand that capacity.
Build in a spare allowance
One 100-count pack supplies one inner for each card in a 100-card deck. If the setup includes ten additional cards, a second pack is needed under the stated quantity. Do not budget around unpromised extra sleeves.
What to compare it with
KMC Perfect Fit — Standard Topload
Compare a conventional inner with its own maker-stated pairing.
Gamegenic Inner Sleeves — Standard Clear
An alternative that separately lists sleeve and supported-card dimensions.
Sources & verification
- Ultimate Guard Katana Inner — Standard — manufacturer specifications — Manufacturer documentation. Verified 2026-09-26.