diff --git a/Project.toml b/Project.toml
index b9c4233..9ef979f 100644
--- a/Project.toml
+++ b/Project.toml
@@ -9,6 +9,7 @@ Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"
 BSON = "fbb218c0-5317-5bc6-957e-2ee96dd4b1f0"
 CUDA = "052768ef-5323-5732-b1bb-66c8b64840ba"
 Distributions = "31c24e10-a181-5473-b8eb-7969acd0382f"
+ElasticArrays = "fdbdab4c-e67f-52f5-8c3f-e7b388dad3d4"
 FillArrays = "1a297f60-69ca-5386-bcde-b61e274b549b"
 Flux = "587475ba-b771-5e3f-ad9e-33799f191a9c"
 GPUArrays = "0c68f7d7-f131-5f86-a1c3-88cf8149b2d7"
diff --git a/src/components/trajectories/trajectory.jl b/src/components/trajectories/trajectory.jl
index da06ecb..b99a6af 100644
--- a/src/components/trajectories/trajectory.jl
+++ b/src/components/trajectories/trajectory.jl
@@ -3,13 +3,18 @@ export Trajectory,
     EpisodicTrajectory,
     CombinedTrajectory,
     CircularCompactSATrajectory,
+    VectCompactSATrajectory,
+    ElasticCompactSATrajectory,
     CircularCompactSALTrajectory,
     CircularCompactSARTSATrajectory,
+    VectCompactSARTSATrajectory,
+    ElasticCompactSARTSATrajectory,
     CircularCompactPSARTSATrajectory,
     CircularCompactSALRTSALTrajectory,
     CircularCompactPSALRTSALTrajectory
 
 using MacroTools: @forward
+using ElasticArrays
 
 #####
 # Trajectory
@@ -175,6 +180,37 @@ end
 
 isfull(t::CombinedTrajectory) = isfull(t.t1) && isfull(t.t2)
 
+#####
+# VectCompactSATrajectory
+#####
+
+const VectCompactSATrajectory = CombinedTrajectory{
+    <:SharedTrajectory{
+        <:Vector,
+        <:NamedTuple{(:state, :next_state, :full_state)},
+    },
+    <:SharedTrajectory{
+        <:Vector,
+        <:NamedTuple{(:action, :next_action, :full_action)},
+    }
+}
+
+function VectCompactSATrajectory(;
+    state_type = Int,
+    action_type = Int,
+    )
+    CombinedTrajectory(
+        SharedTrajectory(
+            Vector{state_type}(),
+            :state,
+        ),
+        SharedTrajectory(
+            Vector{action_type}(),
+            :action,
+        ),
+    )
+end
+
 #####
 # CircularCompactSATrajectory 
 #####
@@ -209,6 +245,40 @@ function CircularCompactSATrajectory(;
     )
 end
 
+#####
+# ElasticCompactSATrajectory 
+#####
+
+const ElasticCompactSATrajectory = CombinedTrajectory{
+    <:SharedTrajectory{
+        <:ElasticArray,
+        <:NamedTuple{(:state, :next_state, :full_state)},
+    },
+    <:SharedTrajectory{
+        <:ElasticArray,
+        <:NamedTuple{(:action, :next_action, :full_action)},
+    },
+}
+
+function ElasticCompactSATrajectory(;
+    state_type = Int,
+    state_size = (),
+    action_type = Int,
+    action_size = (),
+)
+    CombinedTrajectory(
+        SharedTrajectory(
+            ElasticArray{state_type}(undef, state_size..., 0),
+            :state,
+        ),
+        SharedTrajectory(
+            ElasticArray{action_type}(undef, action_size..., 0),
+            :action,
+        ),
+    )
+end
+
+
 #####
 # CircularCompactSALTrajectory 
 #####
@@ -240,6 +310,35 @@ function CircularCompactSALTrajectory(;
         CircularCompactSATrajectory(; capacity = capacity, kw...),
     )
 end
+
+#####
+# VectCompactSARTSATrajectory
+#####
+
+const VectCompactSARTSATrajectory = CombinedTrajectory{
+    <:Trajectory{
+        <:NamedTuple{
+            (:reward, :terminal),
+            <:Tuple{<:Vector,<:Vector},
+        },
+    },
+    <:VectCompactSATrajectory,
+}
+
+function VectCompactSARTSATrajectory(;
+    reward_type = Float32,
+    terminal_type = Bool,
+    kw...,
+)
+    CombinedTrajectory(
+        Trajectory(
+            reward = Vector{reward_type}(),
+            terminal = Vector{terminal_type}(),
+        ),
+        VectCompactSATrajectory(; kw...),
+    )
+end
+
 #####
 # CircularCompactSARTSATrajectory
 #####
@@ -271,6 +370,37 @@ function CircularCompactSARTSATrajectory(;
     )
 end
 
+#####
+# ElasticCompactSARTSATrajectory
+#####
+
+const ElasticCompactSARTSATrajectory = CombinedTrajectory{
+    <:Trajectory{
+        <:NamedTuple{
+            (:reward, :terminal),
+            <:Tuple{<:ElasticArray,<:ElasticArray},
+        },
+    },
+    <:ElasticCompactSATrajectory,
+}
+
+function ElasticCompactSARTSATrajectory(;
+    reward_type = Float32,
+    reward_size = (),
+    terminal_type = Bool,
+    terminal_size = (),
+    kw...,
+)
+    CombinedTrajectory(
+        Trajectory(
+            reward = ElasticArray{reward_type}(undef, reward_size..., 0),
+            terminal = ElasticArray{terminal_type}(undef, terminal_size..., 0),
+        ),
+        ElasticCompactSATrajectory(; kw...),
+    )
+end
+
+
 #####
 # CircularCompactSALRTSALTrajectory
 #####
diff --git a/src/extensions/ElasticArrays.jl b/src/extensions/ElasticArrays.jl
new file mode 100644
index 0000000..5820b2b
--- /dev/null
+++ b/src/extensions/ElasticArrays.jl
@@ -0,0 +1,11 @@
+using ElasticArrays
+
+Base.push!(a::ElasticArray, x) = append!(a, x)
+Base.empty!(a::ElasticArray) = ElasticArrays.resize_lastdim!(A, 0)
+
+function Base.pop!(a::ElasticArray)
+    # ??? Is it safe to do so?
+    last_frame = selectdim(a, ndims(a), size(a, ndims(a)))
+    ElasticArrays.resize_lastdim!(A, size(a, ndims(a))-1)
+    last_frame
+end
\ No newline at end of file
diff --git a/src/extensions/extensions.jl b/src/extensions/extensions.jl
index 3fab88b..9375b69 100644
--- a/src/extensions/extensions.jl
+++ b/src/extensions/extensions.jl
@@ -2,3 +2,4 @@ include("Flux.jl")
 include("CUDA.jl")
 include("Zygote.jl")
 include("ReinforcementLearningBase.jl")
+include("ElasticArrays.jl")
diff --git a/test/components/trajectories.jl b/test/components/trajectories.jl
index 5793dc2..844a2b2 100644
--- a/test/components/trajectories.jl
+++ b/test/components/trajectories.jl
@@ -155,4 +155,32 @@
         @test t[:full_state] == []
         @test t[:full_action] == []
     end
+
+    @testset "VectCompactSARTSATrajectory" begin
+        t = VectCompactSARTSATrajectory(;state_type=Vector{Float32}, action_type=Int, reward_type=Float32, terminal_type=Bool)
+        push!(t; state=Float32[1,1], action=1)
+        push!(t; reward=1f0, terminal=false, state=Float32[2,2], action=2)
+        push!(t; reward=2f0, terminal=true, state=Float32[3,3], action=3)
+
+        @test t[:state] == [Float32[1,1], Float32[2,2]]
+        @test t[:action] == [1,2]
+        @test t[:reward] == [1f0,2f0]
+        @test t[:terminal] == [false,true]
+        @test t[:next_state] == [Float32[2,2], Float32[3,3]]
+        @test t[:next_action] == [2,3]
+    end
+
+    @testset "ElasticCompactSARTSATrajectory" begin
+        t = ElasticCompactSARTSATrajectory(;state_type=Float32, state_size=(2,), action_type=Int, reward_type=Float32, terminal_type=Bool)
+        push!(t; state=Float32[1,1], action=1)
+        push!(t; reward=1f0, terminal=false, state=Float32[2,2], action=2)
+        push!(t; reward=2f0, terminal=true, state=Float32[3,3], action=3)
+
+        @test t[:state] == Float32[1 2; 1 2]
+        @test t[:action] == [1, 2]
+        @test t[:reward] == [1f0, 2f0]
+        @test t[:terminal] == [false, true]
+        @test t[:next_state] == Float32[2 3; 2 3]
+        @test t[:next_action] == [2, 3]
+    end
 end