The best deck box for Commander, by the numbers

The best deck box for Commander is one confirmed to hold 100 double sleeved cards with real margin, not just a "100+" sticker. Based on measured interior depths and community-verified fits, the strongest picks are the Dragon Shield Double Shell (90mm interior), the Gamegenic Sidekick 100+ XL and Sidekick Pro 100+ XL (78mm each), the Ultra Pro Satin Tower (76mm), the Ultra Pro Eclipse PRO 100+ (75mm), the Ultimate Guard Deck Case 100+ (74mm), and the Ultimate Guard Sidewinder 100+ XenoSkin (69mm). All seven are documented fitting 100 double sleeved cards, and they span a real range of margin, from cavernous to properly snug.

Why interior depth is the number that matters

A standard Commander deck is 99 cards plus a commander, and most players run a full 100 double sleeved with an inner and outer layer. That stack measures somewhere between 66mm and 70mm depending on sleeve brand, so the box's interior depth needs to clear that range with something to spare for wear, a token, or a slightly thicker pull. A box's exterior size tells you almost nothing useful here. Interior depth is the whole game.

The ranking

1. Dragon Shield Double Shell, 90mm interior. The roomiest interior on this list by a wide margin, built explicitly for 100 double sleeved cards plus tokens or dice. It's the safe answer for literally any sleeve combo, including thicker inner sleeves that trip up tighter boxes. If you play a deck with a lot of tokens riding along, this is the pick.

2. Gamegenic Sidekick 100+ XL Convertible, 78mm interior. Gamegenic built the XL line specifically to solve the double sleeving problem, and it shows. Gamegenic states it fits 100 double sleeved cards even in particularly thick inner sleeves, and the 78mm interior backs that up with real headroom over the roughly 70mm a thick stack actually needs.

3. Gamegenic Sidekick Pro 100+ XL Convertible, 78mm interior. The Pro shares the same 78mm interior as the standard Sidekick XL and the same stated 100 double sleeved rating. Pick this one over the standard Sidekick if you want the upgraded materials; the fit math is identical.

4. Ultra Pro Satin Tower Deck Box, 76mm interior. The long-standing community default for double sleeved Commander decks, and for good reason. At 76mm it swallows even a thick Dragon Shield Matte stack (roughly 70mm) with room left over, and it includes a small dice compartment in the base.

5. Ultra Pro Eclipse PRO 100+ Deck Box, 75mm interior. Don't confuse this with the smaller Eclipse 2-Piece, which measures a much tighter 66.4mm and fails double sleeved decks outright. The PRO version actually holds 100 double sleeved cards in any mainstream combo.

6. Ultimate Guard Deck Case 100+, 74mm interior. The basic snap-closure Deck Case clears even Dragon Shield Matte stacks comfortably, and it does it without the premium price of the XenoSkin line. A good budget pick that still actually works.

7. Ultimate Guard Sidewinder 100+ XenoSkin, 69mm interior. The tightest confirmed fit on this list, but Ultimate Guard specifically positions the Sidewinder 100+ as ideal for a double sleeved Commander deck, and its magnetic side-loading design tolerates a snug stack better than a top-loading lid does. Fine for most combos; skip it if you're running the thickest Dragon Shield stacks and want extra margin.

If you already own several Ultimate Guard Boulder boxes and don't want to switch families, the community workaround is sizing up to the Boulder 133+, which Ultimate Guard rates for 133 double sleeved cards and leaves ample slack for a 100 card Dragon Shield deck. We break down the whole Boulder line, including where it earns its rating and where it doesn't, in our Ultimate Guard Boulder size guide.

Quick answers

Do I need 90mm of interior depth for a Commander deck? No, that's the roomiest option, not the minimum. Anything from 69mm up worked in verified testing; more depth just buys margin for thicker sleeves or extra pieces riding along.

What about the Ultimate Guard Boulder 100+ everyone talks about? Skip it for double sleeved Commander unless you're running thin KMC combos. Its 68.3mm interior is one of the smallest in this category and it's a documented failure point with Dragon Shield Mattes.

Is a magnetic side-loading box better than a top-loading one for a tight fit? Based on the Sidewinder's positioning and reported use, side-loading designs tend to handle snug stacks a bit better than friction-fit top lids, though a box with real depth margin sidesteps the question entirely.

Whatever you land on, check your exact sleeve combo against the numbers with the fit checker before buying, and see the full verified list for 100 double sleeved cards if you want the complete picture beyond these seven. Depth is the spec that decides everything else about how your deck sits on the table.