A Deck Box Built Like a Boulder
The Ultimate Guard Boulder 100 is one of the most trusted deck boxes in competitive play — and The Shogun's Journey III edition in Soushin Blue brings that same bulletproof engineering wrapped in a striking limited art treatment. The rigid polypropylene shell takes its cues from the Boulder name: dense, impact-resistant, and built to take the knocks of a tournament bag without complaint. If you're carrying a deck you care about, this is the kind of box that earns its keep.
Capacity & Sleeve Compatibility
The Boulder 100 fits 100 single-sleeved cards comfortably — the standard for Commander, Modern, Pioneer, and most 60- and 100-card formats. It is also confirmed double-sleeve compatible, accommodating a full deck of double-sleeved cards, which is a meaningful distinction for players who layer inner sleeves under their Dragon Shields or KMC Hyper Mattes. That double-sleeve compatibility alone puts it in a different category from basic snap-lid cases.
Closure & Construction
The Boulder uses Ultimate Guard's signature QuadGuard hinged lid, which opens wide and stays open during deck-building or play without flopping shut on your hand. The lid snaps closed with a satisfying, positive click and holds securely through the chaos of a full bag. A generous thumb notch at the front makes drawing cards clean and fast. The interior is smooth and consistent — cards slide in and out without snagging.
The Shogun's Journey III — Soushin Blue
This is part of Ultimate Guard's ongoing collaboration with artists for limited-edition Boulder designs. The Soushin Blue colourway ties into The Shogun's Journey III series, giving the box a deep, considered aesthetic that reads well on the table. It fits naturally alongside decks built around trading card games with strong visual identities — including Magic: The Gathering, One Piece, and beyond. It's a box that looks intentional, not just functional.
Who It's For
The Boulder 100 is the go-to for competitive and semi-competitive players who want a durable, no-nonsense daily carry without sacrificing style. It's equally at home at a Commander table or in a tournament backpack. The Soushin Blue art edition makes it a genuinely appealing gift for players who follow Ultimate Guard's collector releases — or anyone who's ready to retire a worn-out box and upgrade to something that lasts.
Specifications
| Specification | Detail |
|---|---|
| Brand | Ultimate Guard |
| Capacity | 100 single-sleeved cards |
| Closure | QuadGuard hinged snap lid |
| Material | Rigid polypropylene |
| Double-Sleeve Compatible | Yes |
| Edition | The Shogun's Journey III — Soushin Blue |
| Extras | None |
