diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index 30ace1803b1a..c08722327494 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -384,6 +384,7 @@ export type {
   ProfileChunkEnvelope,
   ProfileChunkItem,
   SpanEnvelope,
+  SpanV2Envelope,
   SpanItem,
   LogEnvelope,
   MetricEnvelope,
@@ -451,6 +452,9 @@ export type {
   SpanJSON,
   SpanContextData,
   TraceFlag,
+  SpanV2JSON,
+  SerializedSpanContainer,
+  SerializedSpan,
 } from './types-hoist/span';
 export type { SpanStatus } from './types-hoist/spanStatus';
 export type { Log, LogSeverityLevel } from './types-hoist/log';
diff --git a/packages/core/src/types-hoist/envelope.ts b/packages/core/src/types-hoist/envelope.ts
index 272f8cde9f62..7251f85b5df0 100644
--- a/packages/core/src/types-hoist/envelope.ts
+++ b/packages/core/src/types-hoist/envelope.ts
@@ -11,7 +11,7 @@ import type { Profile, ProfileChunk } from './profiling';
 import type { ReplayEvent, ReplayRecordingData } from './replay';
 import type { SdkInfo } from './sdkinfo';
 import type { SerializedSession, SessionAggregates } from './session';
-import type { SpanJSON } from './span';
+import type { SerializedSpanContainer, SpanJSON } from './span';
 
 // Based on: https://develop.sentry.dev/sdk/envelopes/
 
@@ -91,6 +91,21 @@ type CheckInItemHeaders = { type: 'check_in' };
 type ProfileItemHeaders = { type: 'profile' };
 type ProfileChunkItemHeaders = { type: 'profile_chunk' };
 type SpanItemHeaders = { type: 'span' };
+type SpanContainerItemHeaders = {
+  /**
+   * Same as v1 span item type but this envelope is distinguished by {@link SpanContainerItemHeaders.content_type}.
+   */
+  type: 'span';
+  /**
+   * The number of span items in the container. This must be the same as the number of span items in the payload.
+   */
+  item_count: number;
+  /**
+   * The content type of the span items. This must be `application/vnd.sentry.items.span.v2+json`.
+   * (the presence of this field also distinguishes the span item from the v1 span item)
+   */
+  content_type: 'application/vnd.sentry.items.span.v2+json';
+};
 type LogContainerItemHeaders = {
   type: 'log';
   /**
@@ -123,6 +138,7 @@ export type FeedbackItem = BaseEnvelopeItem<FeedbackItemHeaders, FeedbackEvent>;
 export type ProfileItem = BaseEnvelopeItem<ProfileItemHeaders, Profile>;
 export type ProfileChunkItem = BaseEnvelopeItem<ProfileChunkItemHeaders, ProfileChunk>;
 export type SpanItem = BaseEnvelopeItem<SpanItemHeaders, Partial<SpanJSON>>;
+export type SpanContainerItem = BaseEnvelopeItem<SpanContainerItemHeaders, SerializedSpanContainer>;
 export type LogContainerItem = BaseEnvelopeItem<LogContainerItemHeaders, SerializedLogContainer>;
 export type MetricContainerItem = BaseEnvelopeItem<MetricContainerItemHeaders, SerializedMetricContainer>;
 export type RawSecurityItem = BaseEnvelopeItem<RawSecurityHeaders, LegacyCSPReport>;
@@ -133,6 +149,7 @@ type CheckInEnvelopeHeaders = { trace?: DynamicSamplingContext };
 type ClientReportEnvelopeHeaders = BaseEnvelopeHeaders;
 type ReplayEnvelopeHeaders = BaseEnvelopeHeaders;
 type SpanEnvelopeHeaders = BaseEnvelopeHeaders & { trace?: DynamicSamplingContext };
+type SpanV2EnvelopeHeaders = BaseEnvelopeHeaders & { trace?: DynamicSamplingContext };
 type LogEnvelopeHeaders = BaseEnvelopeHeaders;
 type MetricEnvelopeHeaders = BaseEnvelopeHeaders;
 export type EventEnvelope = BaseEnvelope<
@@ -144,6 +161,7 @@ export type ClientReportEnvelope = BaseEnvelope<ClientReportEnvelopeHeaders, Cli
 export type ReplayEnvelope = [ReplayEnvelopeHeaders, [ReplayEventItem, ReplayRecordingItem]];
 export type CheckInEnvelope = BaseEnvelope<CheckInEnvelopeHeaders, CheckInItem>;
 export type SpanEnvelope = BaseEnvelope<SpanEnvelopeHeaders, SpanItem>;
+export type SpanV2Envelope = BaseEnvelope<SpanV2EnvelopeHeaders, SpanContainerItem>;
 export type ProfileChunkEnvelope = BaseEnvelope<BaseEnvelopeHeaders, ProfileChunkItem>;
 export type RawSecurityEnvelope = BaseEnvelope<BaseEnvelopeHeaders, RawSecurityItem>;
 export type LogEnvelope = BaseEnvelope<LogEnvelopeHeaders, LogContainerItem>;
@@ -157,6 +175,7 @@ export type Envelope =
   | ReplayEnvelope
   | CheckInEnvelope
   | SpanEnvelope
+  | SpanV2Envelope
   | RawSecurityEnvelope
   | LogEnvelope
   | MetricEnvelope;
diff --git a/packages/core/src/types-hoist/link.ts b/packages/core/src/types-hoist/link.ts
index a330dc108b00..9a117258200b 100644
--- a/packages/core/src/types-hoist/link.ts
+++ b/packages/core/src/types-hoist/link.ts
@@ -22,9 +22,9 @@ export interface SpanLink {
  * Link interface for the event envelope item. It's a flattened representation of `SpanLink`.
  * Can include additional fields defined by OTel.
  */
-export interface SpanLinkJSON extends Record<string, unknown> {
+export interface SpanLinkJSON<TAttributes = SpanLinkAttributes> extends Record<string, unknown> {
   span_id: string;
   trace_id: string;
   sampled?: boolean;
-  attributes?: SpanLinkAttributes;
+  attributes?: TAttributes;
 }
diff --git a/packages/core/src/types-hoist/span.ts b/packages/core/src/types-hoist/span.ts
index d82463768b7f..d5cff749c68e 100644
--- a/packages/core/src/types-hoist/span.ts
+++ b/packages/core/src/types-hoist/span.ts
@@ -1,3 +1,4 @@
+import type { Attributes, RawAttributes } from '../attributes';
 import type { SpanLink, SpanLinkJSON } from './link';
 import type { Measurements } from './measurement';
 import type { HrTime } from './opentelemetry';
@@ -34,6 +35,43 @@ export type SpanAttributes = Partial<{
 /** This type is aligned with the OpenTelemetry TimeInput type. */
 export type SpanTimeInput = HrTime | number | Date;
 
+/**
+ * Intermediate JSON reporesentation of a v2 span, which users and our SDK integrations will interact with.
+ * This is NOT the final serialized JSON span, but an intermediate step still holding raw attributes.
+ * The final, serialized span is a {@link SerializedSpan}.
+ * Main reason: Make it easier and safer for users to work with attributes.
+ */
+export interface SpanV2JSON {
+  trace_id: string;
+  parent_span_id?: string;
+  span_id: string;
+  name: string;
+  start_timestamp: number;
+  end_timestamp: number;
+  status: 'ok' | 'error';
+  is_segment: boolean;
+  attributes?: RawAttributes<Record<string, unknown>>;
+  links?: SpanLinkJSON<RawAttributes<Record<string, unknown>>>[];
+}
+
+/**
+ * Serialized span item.
+ * This is the final, serialized span format that is sent to Sentry.
+ * The intermediate representation is {@link SpanV2JSON}.
+ * Main difference: Attributes are converted to {@link Attributes}, thus including the `type` annotation.
+ */
+export type SerializedSpan = Omit<SpanV2JSON, 'attributes' | 'links'> & {
+  attributes?: Attributes;
+  links?: SpanLinkJSON<Attributes>[];
+};
+
+/**
+ * Envelope span item container.
+ */
+export type SerializedSpanContainer = {
+  items: Array<SerializedSpan>;
+};
+
 /** A JSON representation of a span. */
 export interface SpanJSON {
   data: SpanAttributes;