Fullbottles

Fullbottles (フルボトル) are the sample bottle-like collectible devices used by the transformation gear in Kamen Rider Build. Conversely, a Bottle without any power is known as an Empty Bottle (エンプティーボトル)

Overview
Fullbottles contain the purified Nebula Gas from the Smash. Sento Kiryu created the Build Driver to use them in order to transform into Kamen Rider Build.

After Build defeats a Smash, he uses an Empty Bottle to absorb the gas from the victim, causing the Bottle to swell and gain a black spiderweb pattern. Through a mysterious power held by Misora Isurugi and a modified microwave machine in nascita's basement, the harmful properties are purified, leading to the creation of a Fullbottle which can then be used by Build.

Before undergoing the purification process, the contents of an unpurified Bottle can be poured upon the victim, transforming them back into a Smash.

Functionality
Two Fullbottles are used at once in the Build Driver, one organic and one inorganic. Any pair of organic and inorganic Fullbottles can be used to create a Trial Form (トライアルフォーム), but each Fullbottle has a Best Match (ベストマッチ) with another one, creating a perfect combination of powers. If they are used together, they create an especially powerful Best Match form.

Kamen Rider Claws uses only the Dragon Fullbottle to transform, by inserting it into an adapter called the ClawsDragon, and inserting it into the Build Driver.

Night Rogue and Blood Stalk use Fullbottles to transform by inserting them into the Transteam Gun.

Fullbottles may be inserted into certain weapons such as the Drill Crusher or Beat Clawser to activate special finisher attacks. The Lion Fullbottle is used to turn the BuildPhone from phone to bike mode.

Fullbottles can also be utilized to give their users in civilian form temporary superhuman abilities by shaking them. (Ex. The Rabbit Fullbottle gives Sento temporary super speed and agility to evade attacks.)

Unused Fullbottles and Best Matches
Hacking the pin combinations on the DX Build Driver toy reveals sounds for Fullbottles and Best Matches currently not set to be used as real forms or toys.
 * Kyouryuu (恐竜) & F1: "Are you Ready? Onsoku no Teiou! F1Saurus! Yeahhh!"
 * Same (鮫) & Bike (バイク): "Are you Ready? Dokusou Hunter! SameBike! Yeahhh!"
 * Spider (スパイダー) & Reizoko (冷蔵庫): "Are you Ready? Reikyaku no Trap Master! SpiderCooler! Yeahhh!"
 * Kabutomushi (甲虫) & Camera (カメラ): "Are you Ready? Mitsurin no Scoop King! BeetleCamera! Yeahhh!"
 * Obake (お化け) & Magnet (マグネット): "Are you Ready? Samayou Chouinryoku! MagGhost! Yeahhh!"
 * Rose (ローズ) & Helicopter (ヘリコプター): "Are you Ready? Jounutsu no Senpuuki! RoseCopter! Yeahhh!"
 * Bat & Engine (エンジン): "Are you Ready? Ankou no Kidoubou! BatEngine! Yeahhh!"
 * Hachi (蜂) & Sensuikan (潜水艦): "Are you Ready? Shinkai no Shigotojin! HachiMarine! Yeahhh!"
 * Sai (犀) & Dryer (ドライヤー): "Are you Ready? Chounutsu Tairiku! SaiDryer! Yeahhh!"
 * Kuma (熊) & Terebi (テレビ): "Are you Ready? Hachimitsu High Vision! KumaTerebi! Yeahhh!"
 * Dog (ドッグ) & Mic (マイク): "Are you Ready? Yakki no Daibakuon! DogMic! Yeahhh!"
 * Crocodile (クロコダイル) & Rimokon (リモコン): "Are you Ready? Mizugiwa no Denpa yarou! CrocodiCon! Yeahhh!"
 * Kappumen (カップ麺) & Energy Drink (エナジードリンク): "Are you Ready? Soukou Genki! CupEnergy! Yeahhh!"
 * Ghost (ゴースト) & Ex-Aid: "Are you Ready? Batchi Level Up! GhostEx-Aid! Yeahhh!"
 * Gaim (ガイム) & Drive (ドライブ): "Are you Ready? Kajitsu no Top Gear! GaimDrive! Yeahhh!"
 * Wizard (ウィザード) & Fourze (フォーゼ): "Are you Ready? Maho no Uchu Ryoko! FourzeWizard! Yeahhh!"
 * Momotaros (モモタロス) & Densha: "Are you Ready? Den-O! Yeahhh!"
 * Camera & Card (カード): "Are you Ready? Decade! Yeahhh!"
 * Mahoutsukai (魔法使い) & Diamond: "Are you Ready? Wizard! Please! Hi-Hi, Hi-Hi-Hi! Yeahhh!"
 * Orange (オレンジ) & Lock: "Are you Ready? Gaim! Orenji Āmuzu: Hanamichi on Stage! Yeahhh!"
 * Keisatsukan (警察官) & F1: "Are you Ready? Drive! Yeahhh!"
 * Obake & Parka (パーカー): "Are you Ready? Ghost! Let's Go! Kakugo! Gho-Gho-Gho-Ghost! GO! GO! GO! GO! Yeahhh!"
 * Kamen Rider (仮面ライダー) & Super Sentai (スーパー戦隊): "Are you Ready? Nichiasa Saikou! Super Hero Time! Yeahhh!"
 * Buttobasoul (ブットバソウル) & Ganbarizing (ガンバライジング): "Are you Ready? Kikaijikake no Touginjou! ButtobaGanba! Yeahhh!"