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Fit answer

Does a 100-card double-sleeved deck fit the Ultimate Guard Sidewinder 100+ XenoSkin?

Section A–ATo scaleLIMIT69.0 mm66.8 mm100 cards = 67 mm vs 69 mm interior
97%of capacity

It fits

100 double-sleeved cards fit in the Ultimate Guard Sidewinder 100+ XenoSkin.

Community verifiedfrom a real-world fit report
How we know
  1. Community-verified: 100 double-sleeved cards fit in the Ultimate Guard Sidewinder 100+ XenoSkin (Ultimate Guard positions the Sidewinder 100+ as 'ideal for a double sleeved Commander deck' (vs the 80+ for single-sleeved). A forum user runs Dragon Shields + KMC Perfect Fits (non-Hard) in it. Magnetic side-loading design tolerates snug stacks better than top-loaders.).
The gear in this check
Dragon Shield Matte Sleeves (Standard Size)Amazon KMC Card Barrier Perfect Size Inner Sleeves (Standard Size)Amazon Ultimate Guard Sidewinder 100+ XenoSkinAmazon

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Other boxes that fit this stack too

Same 100 cards, room to close the lid.

Ultimate Guard Boulder 133+ (Return to Earth)Ultra Pro Satin Tower Deck BoxUltra Pro Eclipse PRO 100+ Deck BoxDragon Shield Double Shell

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Sources

Try your own combination in the fit checker