diff --git a/packages/types/src/envelope.ts b/packages/types/src/envelope.ts
new file mode 100644
index 000000000000..0c981cb1557a
--- /dev/null
+++ b/packages/types/src/envelope.ts
@@ -0,0 +1,69 @@
+import { SentryRequestType } from './request';
+import { SdkInfo } from './sdkinfo';
+import { Session, SessionAggregates } from './session';
+import { Outcome } from './transport';
+import { User } from './user';
+
+// Based on: https://develop.sentry.dev/sdk/envelopes/
+
+type CommonEnvelopeHeaders = {
+  dsn?: string;
+  sdk?: SdkInfo;
+};
+
+type CommonEnvelopeItemHeaders = {
+  length?: number;
+};
+
+/**
+ * 1st Item: Item headers
+ * 2nd Item: Item payload
+ */
+type BaseEnvelopeItem<ItemHeader extends { type: string }, Payload = unknown> = [
+  CommonEnvelopeItemHeaders & ItemHeader,
+  Payload,
+];
+
+type UnknownEnvelopeItem = BaseEnvelopeItem<{ type: '__unknown__' }>;
+
+type BaseEnvelope<
+  EnvelopeHeaders extends Record<string, unknown>,
+  EnvelopeItem extends BaseEnvelopeItem<{ type: string }>,
+> = {
+  headers: CommonEnvelopeHeaders & EnvelopeHeaders;
+  items: Array<EnvelopeItem | UnknownEnvelopeItem>;
+};
+
+export type EventEnvelopeItem = BaseEnvelopeItem<{ type: 'event' | 'transaction' }, Event>;
+
+type AttachmentEnvelopeItem = BaseEnvelopeItem<{ type: 'attachment'; filename: 'string' }>;
+
+type UserFeedbackEnvelopeItem = BaseEnvelopeItem<
+  { type: 'user_report' },
+  {
+    event_id: string;
+    email: User['email'];
+    name: string;
+    comments: string;
+  }
+>;
+
+export type EventEnvelope = BaseEnvelope<
+  { event_id: string; sent_at: string },
+  EventEnvelopeItem | AttachmentEnvelopeItem | UserFeedbackEnvelopeItem
+>;
+
+export type SessionEnvelopeItem =
+  | BaseEnvelopeItem<{ type: 'session' }, Session>
+  | BaseEnvelopeItem<{ type: 'sessions' }, SessionAggregates>;
+
+export type SessionEnvelope = BaseEnvelope<{ sent_at: string }, SessionEnvelopeItem>;
+
+export type ClientReportEnvelopeItem = BaseEnvelopeItem<
+  { type: 'client_report' },
+  { timestamp: number; discarded_events: { reason: Outcome; category: SentryRequestType; quantity: number } }
+>;
+
+export type ClientReportEnvelope = BaseEnvelope<Record<string, unknown>, ClientReportEnvelopeItem>;
+
+export type Envelope = EventEnvelope | SessionEnvelope | ClientReportEnvelope;
diff --git a/packages/types/src/index.ts b/packages/types/src/index.ts
index ecb62c2937fa..818f50759fa0 100644
--- a/packages/types/src/index.ts
+++ b/packages/types/src/index.ts
@@ -3,6 +3,15 @@ export { Client } from './client';
 export { Context, Contexts } from './context';
 export { DsnComponents, DsnLike, DsnProtocol } from './dsn';
 export { DebugImage, DebugImageType, DebugMeta } from './debugMeta';
+export {
+  ClientReportEnvelope,
+  ClientReportEnvelopeItem,
+  Envelope,
+  EventEnvelope,
+  EventEnvelopeItem,
+  SessionEnvelope,
+  SessionEnvelopeItem,
+} from './envelope';
 export { ExtendedError } from './error';
 export { Event, EventHint } from './event';
 export { EventStatus } from './eventstatus';