CS2 Cases & Drop Pool — jede Case, jede Wahrscheinlichkeit, wie das Supply funktioniert

What a CS2 case actually is

A CS2 weapon case is a tradeable inventory item that, when opened with a paid key ($2.49 from Steam Mobile Authenticator users), returns one randomly-selected weapon skin or knife from a fixed drop pool. The drop pool is set at the moment the case ships and never changes; the random selection is server-side and uses the same RNG for every player.

A case has four properties that define everything else:

1. Its drop pool — the list of skins it can return, organised into five tiers.
2. Its rare special item — a knife model (or, in the case of Glove Cases, a glove model) at the 0.26% gold tier.
3. Its supply state — active (still drops in-game) or discontinued (the drop spigot has been turned off, supply is now fixed).
4. Its current market price — what it trades at on Steam Community Market right now, which floats with demand for the drop pool.

Everything in this guide builds on those four. The drop pool decides the expected value of opening; the special item decides the headline pull; the supply state decides whether you should open or hold; the market price decides whether the math even works at the moment.

The five drop tiers and the official odds

Every CS2 case follows the same five-tier distribution. The percentages are Valve's officially disclosed figures from 2017, identical across every case ever shipped.

The 1:5 ratio between consecutive tiers is hard-coded into the case-opening logic. There are no per-case adjustments, no operation bonuses, no event boosts to drop rates. The one published exception in CS:GO was the Operation Wildfire all-pink case, which used a flat distribution among Covert items only — but that was a one-off promotional case, not a model that has been repeated.

For the deep cut on what these percentages do and do not tell you, see CS2 case opening odds explained.

The drop pool inside one tier

Within a tier, the distribution is uniform. If a Mil-Spec tier has 7 skins, each lands at 79.92% / 7 = ~11.4% per opening. This is what most players misjudge: a strong Covert lineup does not save a case if the Mil-Spec dilution is bad, because 80% of all openings end at Mil-Spec.

The structure of a typical case:

• Mil-Spec (blue): 6-8 skins. The "loss zone" — most are sub-dollar, frequently sub-quarter on dirty exteriors.
• Restricted (purple): 4-6 skins. The "small win" zone — usually $0.50-3 net.
• Classified (pink): 2-4 skins. The "decent win" zone — usually $2-15 net.
• Covert (red): 1-3 skins. The "headline weapon" zone — usually $20-150 net, with a few outliers.
• Rare Special Item (gold): 1 knife model in 13 finishes, or a glove pool of similar size. The "jackpot" zone.

Inside the gold tier, dilution is even heavier. A knife case with 13 Kukri finishes × 5 exteriors × 10% StatTrak roll = 130 distinct (finish, exterior, StatTrak) combinations. Each specific combination is roughly 0.0026 / 130 = 0.00002% per opening. A Factory New StatTrak Kukri Fade is rarer than 1 in 50,000 openings.

StatTrak — the independent 10% roll

StatTrak is a kill-counter flag that adds a typically 30-100% premium to the price of a skin. It applies to weapons and knives, never to gloves.

The roll is independent of the rarity tier. After Valve picks the rarity (Mil-Spec/Restricted/Classified/Covert/Knife), it does a separate 10% roll for StatTrak. So:

• 10% of all openings have StatTrak, regardless of tier.
• A StatTrak knife has a 0.26% × 10% = 0.026% per opening rate, or roughly 1 in 3,860.
• A StatTrak Mil-Spec has a 79.92% × 10% = ~7.99% per opening rate.

The premium varies wildly by skin. A StatTrak AK-47 Redline trades at roughly +60% over the non-StatTrak price; a StatTrak Karambit Doppler Phase 4 at +40% in absolute dollars but lower in percentage; a StatTrak Howl is uniquely valuable because the underlying skin is contraband. See the StatTrak glossary entry for the full premium breakdown.

Active vs discontinued cases — the supply economics

The single most important distinction in case economics is whether the case is in the active drop pool (still being produced from playing the game) or discontinued (production stopped, supply fixed).

Active cases

An active case drops as a random reward when you complete a match (~once a week per account, plus weekly care package). Production is continuous, so supply grows linearly with the player base playing the game. Case prices stay low — usually $0.20 to $3 — because there is more supply being printed every week than there is demand to open and hold.

Active cases as of May 2026 (representative subset): Kilowatt, Gallery, Fever, Revolution, Recoil, Dreams & Nightmares, Snakebite, Operation Riptide, Fracture, Prisma 2, Shattered Web. The full list shifts as Valve rotates which cases drop in the weekly care package.

The economic profile of an active case:

• Cheap to buy.
• Negative expected value to open (typically −75 to −85%).
• Stable price (supply > demand pressure).
• Will eventually be discontinued — sometimes within a year of shipping, sometimes after a decade.

Discontinued cases

A discontinued case has been removed from the active drop pool. No more print runs from match drops; supply is now fixed at whatever was already in circulation.

Once supply is fixed, the case price is governed entirely by demand:

• Players who want to open for nostalgia or specific knives drive baseline demand.
• Players who hold cases as a long-term store of value drive speculative demand.
• The result is a slow, steady appreciation curve — most discontinued cases double in value within 2-3 years of going out of rotation, then continue to grind upward indefinitely.

The poster children: the original CS:GO Weapon Case ($80 in 2026, up from $0.50 baseline), the eSports 2013 cases ($60), the Bravo Case (~$50). For the current snapshot of which cases have appreciated most, see top 10 most expensive CS2 cases.

The economic insight: a discontinued case is a better hold than an open. Opening locks in the EV of the drop pool minus the cost — almost always negative. Holding lets the case price appreciate while the underlying skins also appreciate, often producing positive returns over 1-3 year horizons.

The expected value of opening — the math

EV per opening = sum across all tiers of (drop_chance × average net skin value in tier). Subtract the cost of (case + key) to get net expected return.

A typical active case at May 2026 prices:

Stake per opening: case (~$1) + key ($2.49) = $3.49. Net expected return: $0.89 − $3.49 = −$2.60 per opening. As a percentage: −74%.

That −74% is consistent across every active case. The pricing of the drop pool moves up and down a few percentage points with the market, but the structural shape never gets above −70% for an active case. The full walk-through on three real cases (Kilowatt, Fever, Revolution) is in the real expected value of opening CS2 cases.

The Steam Market 15% fee — the silent killer

Every figure in the EV calculation has to be net of the 15% Steam Market fee (5% Steam, 10% game-side). A skin listed at $10 nets the seller $8.70 after fees. Most community EV calculators forget this and quote gross numbers, which inflates the EV by 17.6%.

The fee applies on every Steam Market sale. Third-party marketplaces have different fee structures — Buff163's effective seller fee is around 2.5%, Skinport's seller-side is 12% but with payout flexibility, DMarket and CSFloat sit in between. If you are valuing your inventory as opening EV recoverable on the market, the right comparison is net of whichever marketplace fee you actually use to sell, not the Steam buy-now price. The marketplaces guide covers the fee structures in full.

Drop pool variations — what makes one case different from another

All cases share the same five-tier distribution, but the contents of each tier are different. Three axes determine whether a case is high-value or low-value:

Knife model

Each case ships with one knife model (Kukri in Kilowatt and Gallery, Karambit/M9/Bayonet/Butterfly/etc. in older cases). Some knife models trade higher than others — a Karambit Fade outsells a Falchion Fade by 5-10× — and the choice of knife model dominates the gold-tier value.

The historical pattern: Karambit, Butterfly Knife, M9 Bayonet, Bayonet are the headline models. Stiletto, Talon, Skeleton are mid-tier. Falchion, Bowie, Gut, Shadow Daggers, Huntsman, Flip, Navaja, Ursus, Survival, Paracord, Nomad, Classic, Kukri are the lower-tier models on average pricing — though specific finishes can buck the trend (a Kukri Marble Fade trades higher than a Falchion Fade).

For the per-knife breakdown, the /guides/cs2-knives-and-gloves pillar — shipping in a later wave of this cocoon — covers each model.

Covert lineup

The Covert pair determines the headline weapon-tier outcome. Strong Covert pairs (AK-47 Inheritance + AWP Chrome Cannon in Kilowatt; AK-47 Asiimov + AWP Hyper Beast in older cases) command premium prices even on dirty exteriors. Weak Covert pairs (where neither weapon has cult appeal) land in the $20-40 net range and don't move the EV needle.

The bias to look for: Covert pairs that include AK-47 or AWP skins. Those two weapons drive the bulk of weapon demand in CS2; M4A4 and M4A1-S Coverts trade at a discount because the CT rifle market is thinner.

Mil-Spec floor

The cheapest tier is where 80% of openings die. A case with sub-quarter Mil-Spec averages (typical) gives 80% of openings a useless drop. A case with $0.50+ Mil-Spec average (rare, usually older cases) puts a tiny floor under the EV. The difference between "Mil-Spec average $0.15" and "Mil-Spec average $0.40" is roughly $0.20 in EV per opening — enough to move a case from −80% return to −74% return, but not enough to make any active case profitable.

Sticker capsules and souvenir packages — separate systems

CS2 has three other random-pull systems that often get conflated with cases:

• Sticker capsules (covered in the /guides/cs2-stickers-and-capsules pillar when it ships) — drop one sticker from a fixed pool. Different odds structure (paper > holo > foil > gold), no rare special item tier. Used for tournament stickers (Major + non-Major) and community-design capsules.
• Souvenir packages — drop during Majors when you watch with linked Steam. Drop pool is the active map collection (Vertigo, Inferno, Mirage, etc.), and the rare drop is a Souvenir version of a Covert from that collection. The famous Souvenir AWP Dragon Lores come from Cobblestone packages during the original Cologne 2014 Major.
• Operation reward selectors — give the player a choice of skin from a curated list. Not random; not cases.

This pillar covers weapon cases only. The other systems share some of the math but have different structural properties.

How cases ship and how they retire

A new weapon case ships every 6-12 months on average. The Kilowatt Case in February 2024 was the first CS2-original case (i.e. designed for CS2 from the ground up rather than ported from CS:GO). The Gallery Case shipped later in the same cycle. New cases since then have followed the standard pattern: 17 weapon skins, 1 knife model in 13 finishes, $2.49 key, immediate slot in the active drop pool.

Cases retire on a Valve-decided cadence. The most reliable signal is the weekly care package: when a case is no longer offered as a care package option for several months running, it is effectively discontinued. Valve does not usually announce the retirement; the community detects it by watching the care package rotation.

When a case retires, three things happen in sequence:

1. Week 0-4: case price flat or slightly up. Speculators position into the case, but most casual players do not yet notice the change.
2. Week 4-12: case price climbs as the unboxing demand continues against fixed supply. This is when the case typically doubles or triples from baseline.
3. Year 1+: slow grind upward. The case price continues to appreciate as opening removes supply from circulation.

The window when opening a discontinued case has positive EV is the brief gap between supply lock and case price catching up. That gap is usually 1-4 weeks for popular cases and longer for obscure ones; in practice, most retail openers miss it.

Operation cases and the special edge cases

Two types of cases break the standard mold and deserve their own note:

Operation cases. Some cases shipped only during specific Operations (Operation Bravo Case, Operation Phoenix Weapon Case, Operation Vanguard Weapon Case, Operation Wildfire Case, Operation Hydra Case, Operation Broken Fang Case, Operation Riptide Case). They followed the same five-tier odds as standard cases but were tied to an Operation pass purchase or to specific in-game challenges. Once the Operation ended, the case stopped dropping — these cases are effectively all discontinued today. They tend to appreciate faster than standard discontinued cases because the supply window was shorter.

Glove cases. Glove Case (2016), Operation Hydra Case, Clutch Case, Shattered Web Case, Snakebite Case, Operation Riptide Case, the gloves variant of the Recoil Case, Dreams & Nightmares Case, and Operation Broken Fang Case ship gloves at the 0.26% gold tier instead of knives. The same five-tier distribution applies; the gold pool just contains gloves instead of knives. Glove drops are not StatTrak-eligible (the StatTrak system does not apply to gloves), so the 10% StatTrak roll only affects weapons in those cases.

The Souvenir-package distinction. Souvenir packages (dropped during Majors when watching with linked Steam) do not follow this five-tier odds structure — they pull from the active map collection at the Major and produce Souvenir-tagged versions of the skins from that collection. The Souvenir Dragon Lore is the famous example. Souvenir packages are not weapon cases and are out of scope for this pillar.

Why drop pool dilution destroys EV

A worked example of how the dilution math punishes case openers. Take a hypothetical case with one $3,000 Karambit Doppler Sapphire as its rarest knife outcome and a Mil-Spec average of $0.10. You'd expect that Sapphire to dominate the EV. It doesn't.

The Sapphire is one specific (finish, exterior, StatTrak) combination inside a 13-finish gold pool. Its real per-opening probability is roughly 0.26% / 13 / 5 / 1.1 ≈ 0.0036%. Contribution to EV: $3,000 × 0.0036% = $0.11 per opening. The Mil-Spec floor at 80% × $0.10 = $0.08 contributes almost as much.

This is the structural reason cases never break even at retail. The headline pulls are dramatic but rare; the dilution within the gold tier (multiple finishes, multiple exteriors, the StatTrak roll) means the headline value is divided across hundreds of distinct outcomes, while the Mil-Spec floor at 80% concentrates the loss into the most common result. No active case escapes this.

Where cases plug into the rest of the inventory ecosystem

A case is the upstream of every weapon skin in CS2. Knowing which case a skin came from tells you:

• Which other skins it drops with (the rest of the case's pool).
• Whether the supply is still growing or has been locked.
• What the historical opening volume has been, which sets the absolute supply count.
• Whether StatTrak versions are roughly 10% of the supply (they are, by default, except for very old cases where the StatTrak roll was implemented after launch).

Every per-skin page in the items encyclopedia links upstream to the case that drops it. The case page in turn lists every skin in the drop pool with current prices and odds. The two surfaces are designed to be browsed together.

Buying skins vs opening cases

For specific skin acquisition, opening cases is the worst path by an order of magnitude. The EV math says you spend roughly 4-5× the direct buy cost in expectation to land a specific Covert skin via opening. The variance pushes that further; the "best case" for direct buy is just the Steam Market or a third-party marketplace at the listed price.

Opening makes sense only when:

• The drop pool, on average, has more value than the case + key cost (essentially never for active cases, occasionally for newly-discontinued cases for short windows).
• The entertainment value of the opening process exceeds the expected loss.
• You are stress-testing a calculator or otherwise have a reason that is not "I want this skin".

For everything else: pick the skin from the items encyclopedia, pick a marketplace from the marketplaces guide, and buy directly. If you want to know what your existing inventory is worth before deciding, the inventory calculator handles that in one click.

Where to track case prices

Steam Community Market is the canonical source for case median prices, with seven-day history visible on the case listing page. Third-party aggregators (Buff163, Skinport, DMarket, CSFloat, CS.Money) carry cases at different price points — usually 5-15% lower than Steam because of fee differences. The marketplaces pillar covers each one in detail.

The /cases programmatic pages on this site, when they ship in the items DB rollout, will list every case with its current Steam median, the multi-marketplace comparison, and the EV math live-computed. Until then, the spokes in this pillar (the Kilowatt and Gallery deep-dives, the top 10 most expensive cases snapshot, the best to open for profit ROI breakdown) cover specific cases by name.

Why this pillar matters for the rest of the site

Cases are upstream of every skin. The math here governs:

• The supply curve for every weapon skin → directly informs the items encyclopedia per-skin pricing.
• The economics of trade-up contracts → covered in the /guides/cs2-trade-up-contracts pillar when it ships, since trade-ups consume cases worth of skins as input.
• The investing thesis around cases as an asset class → covered in the skin investing pillar.
• The valuation of discontinued cases as inventory holdings → fed into the inventory calculator.

The five drop tiers, the 0.26% knife rate, the 15% Steam fee, the active vs discontinued distinction — every other piece of CS2 market analysis sits on top of those four facts. The job of this pillar is to make them legible enough that every spoke in the cocoon, and every per-case programmatic page, can reference them without re-deriving from scratch.