Mutable Explorer Sidewinder 100 Deck Box

Built for Double-Sleeved Decks, Ready for Every Session

The Ultimate Guard Mutable Explorer Sidewinder 100 is a deck box that takes its job seriously. Constructed with Ultimate Guard's Xenoskin material — a soft-touch, textured exterior that resists scuffs and feels confident in hand — this isn't a box you toss your deck into as an afterthought. The full-colour Mutable Explorer print makes it a statement piece on the table, while the engineering underneath keeps your cards protected session after session.

Capacity & Sleeve Compatibility

The Sidewinder 100 is optimized specifically for 100 double-sleeved cards in Ultimate Guard sleeves, and fits up to 120 single-sleeved cards without issue. That double-sleeve compatibility isn't an afterthought — it's the design target. If you're running inner sleeves under your Dragon Shields or Katanas for your prized Commander build or competitive Standard deck, this box was built with exactly that stack in mind.

Sidewinder Design & Closure

The Sidewinder format opens from the side rather than the top, giving you smooth, natural access to your deck without flipping the box around or fighting a lid. The magnetic closure delivers a satisfying, secure snap that keeps the box firmly shut in a bag or backpack. The lid holds open during play so you're not wrestling with it mid-game — a small detail that competitive players genuinely appreciate after the fifth round of a long tournament day.

Xenoskin Construction

Xenoskin is Ultimate Guard's premium synthetic material — rigid enough to protect, with a soft matte finish that won't catch or scratch sleeves. The full-colour printed design is integrated into the construction rather than a sticker or surface wrap, so the look stays sharp over time. This is a box built to the same standard as the rest of Ultimate Guard's serious player lineup.

Who This Box Is For

The Mutable Explorer Sidewinder 100 is the right call for the Commander player who double-sleeves their favourites, the tournament regular who needs reliable daily carry, or anyone who wants a deck box that earns its place in the bag rather than just filling it. It also makes a sharp gift for the player in your life who takes their collection seriously — distinctive art, premium feel, and genuine double-sleeve capacity are hard to argue with.