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+Modular Backpack Base
+=====================
+
+.. only:: html
+
+   .. contents::
+
+.. figure:: main_backpack_front.jpg
+   :align: center
+
+This is a basic day pack with MOLLE knock-off/compatible webbing, so
+that it can be expanded with accessories.
+
+.. figure:: main_backpack_back.jpg
+   :align: center
+
+It isn't a beginner's project, as it requires quite some sewing
+confidence and a sewing machine able to sew through multiple layers of
+heavy materials and sew both straigt and zig-zag stitches.
+
+Materials
+---------
+
+You will need:
+
+* 60 cm outer fabric (e.g. coated cordura);
+* 70 cm lining fabric (e.g. ripstop nylon or uncoated, lightweight
+  cordura);
+* a piece of 3D mesh less than 60 cm × 42 cm;
+* two pieces of rigid padding about 30 cm × 42 cm: a rigid foam, or a
+  rigid sheet plus softer foam
+* a piece of heavy padding less than 30 × 42 cm (for the back): 8-10 mm
+  EVA foam or neoprene;
+* a piece of lighter padding less than 30 × 42 cm (for the shoulder
+  straps): 3-4 mm EVA foram or neoprene;
+* 10 meters 2.5 cm webbing (with the color scheme in the pictures this
+  would be a bit more than 3 meters in the fabric color and a bit more
+  than 6 meters in the accent color);
+* 7 meters twill webbing to bind the raw edges:
+* 1 meter waterproof zipper plus sliders etc (to make a 90 cm long
+  zipper);
+* 33 cm round or thin elastic;
+* 1 handle;
+* termoplastic sewable feet;
+* 2 ladderlocks;
+* 2 side release buckles;
+* heavyweight sewing thread (regular all purpose thread isn't strong
+  enough).
+
+Pattern
+-------
+
+You can download the pattern in the following formats:
+
+.. only:: html
+
+   * as a :download:`valentina file <componible_backpack_base.val>`
+     where the measurements can be customized;
+   * as a :download:`A0 pdf file for copyshop printing
+     <componible_backpack_base-copyshop.pdf>`;
+   * as a :download:`A4 tiled pdf file for home printing
+     <componible_backpack_base-A4.pdf>`;
+
+.. only:: not html
+
+   * as a `valentina file
+     <https://sewing-patterns.trueelena.org/_downloads/bee20dc62222a6035be306c39c811a65/componible_backpack_base.val>`_
+     where the measurements can be customized;
+   * as a `A0 pdf file for copyshop printing
+     <https://sewing-patterns.trueelena.org/_downloads/1619da9718f0e8ba6c14ec53f120690e/componible_backpack_base-copyshop.pdf>`_;
+   * as a `A4 tiled pdf file for home printing
+     <https://sewing-patterns.trueelena.org/_downloads/6d7bafcc417c459a9fb5ecadc2934471/componible_backpack_base-A4.pdf>`_;
+
+the latter two formats are based on a finished measurement of 30 cm × 42
+cm × 15 cm (width × height × depth) with 1.2 cm left for the zipper.
+
+Instructions
+------------
+
+.. tip::
+
+   Any time coated / water resistant fabric is involved, only use pins in
+   the sewing allowance, and use a long seam (e.g. 4 mm) to minimize holes
+   in the coating and preserve the water resistance.
+   Binder clips are useful to keep things together while sewing, and so is
+   masking tape, depending on the cases.
+   In the pictures you can see what I used in most cases.
+
+.. tip::
+
+   When working with webbing and edgebinding measure the amount you need,
+   cut and seal the edges with a flame to prevent fraying.
+
+.. tip::
+
+   When sewing TPU-coated fabric sometimes the machine may have issues
+   carrying it; in that case put a piece of tissue paper on the coating
+   while sewing and rip it out afterwards.
+
+Cut all fabric and lining parts according to the pattern, using the
+given sewing allowance (usually 2.5 cm).
+Cut the padding according to the pattern, without the sewing
+allowances.
+Cut the rigid padding about 5 mm smaller than the pattern.
+
+
+Attach the webbing and other accessories to the fabric panels.
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. figure:: m01-webbing.jpg
+   :align: center
+
+Cut 8 pieces of webbing as long as the front panel is wide, seal their
+edges; draw transversal lines at the center and every 4 cm to both edges
+using chalk or a similar disappearing marker.
+
+Put the webbing on the right side of the front panel, starting 5.5 cm
+from the top, and sew on every mark, backtacking once on every line.
+
+
+.. figure:: m10-side_webbing.jpg
+   :align: center
+
+Cut 8 pieces of webbing 15 cm long, seal their edges on a flame, fold
+down one end 2 cm and sew. Also cut 4 pieces of webbing 60 cm long, seal
+their edges.
+
+Put this webbing on each side panel, with the unfolded edge aligned to
+the back edge of the panel and sew every 4 cm from seam near the folded
+edge. Start 3.5 cm from the bottom with a short piece, then a long one,
+3 short, another long and a short one near the top.
+
+.. figure:: m06-handle.jpg
+   :align: center
+
+Attach the handle to the top panel, aligning the webbing edges with the
+edges of the panel. If you want also attach a piece of webbing as long
+as the top panel towards the back, sewing as usual at the center and
+every 4 cm.
+
+.. figure:: m08-bottom_pads.jpg
+   :align: center
+
+Sew the pads to the bottom panel.
+
+Prepare the lining pieces
+^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. figure:: m12-inside_pocket_top.jpg
+   :align: center
+
+.. figure:: m11-inside_pocket_bottom.jpg
+   :align: center
+
+Take the inner pocket lining piece, zigzag the top edge, fold it down 1
+cm and again 2 cm, sew 1-2 mm from the bottom fold to create a channel
+for the elastic.
+
+Place the elastic in the casing, put the wrong side of the pocket on the
+right side of the back panel lining with a pleat at the center bottom,
+sew all around with a seaming allowance of 1.5 cm, backticking over the
+elastic.
+
+Attach the padding to the back
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. figure:: m02-binding_3dmesh.jpg
+   :align: center
+
+Bind the edges of the 3D mesh that will be visible with the twill
+webbing.
+
+.. figure:: m03-back_padding.jpg
+   :align: center
+
+Baste by hand the heavy padding to the fabric back panel with a
+few stitches.
+
+.. figure:: m04-back_3dmesh.jpg
+   :align: center
+
+.. figure:: m05-back_sewed.jpg
+   :align: center
+
+Put the 3D mesh on top and sew near the edge of the mesh,
+enclosing the padding.
+
+Prepare the shoulder straps
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. figure:: m09-shoulder_straps.jpg
+   :align: center
+
+Sandwitch the light padding pieces between a layer of fabric and one of
+3D mesh, bind the edges with the twill webbing.
+
+.. figure:: m16-shoulder_straps.jpg
+   :align: center
+
+Cut two pieces of webbing 46 cm long, seal the edges and sew them to the
+shoulder straps near the top and every 8 cm, attaching the triglides
+near the bottom.
+
+
+.. figure:: m13-strap_triangle-01.jpg
+   :align: center
+
+Cut two pieces of webbing 70 cm long, seal their edges.
+
+Put one end on the right side of one small triangle of fabric, so that
+one edge goes from one corner to the middle of the long side, and there
+are 5 cm of webbing beyond the long side.
+
+.. figure:: m14-strap_triangle-02.jpg
+   :align: center
+
+Fold the triangle in half, right sides facing, and sew 2.5 cm from the
+long edge.
+
+.. figure:: m15-strap_triange-03.jpg
+   :align: center
+
+Turn the triangle inside out, topstitch near the edges of the webbing.
+
+Assemble the sides / add the zipper
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+.. figure:: m07-back_sides.jpg
+   :align: center
+
+Place the top and one side panel of the fabric right sides together, sew
+the short side; repeat with the other side panel. Open the seam and
+(finger-)press the allowances towards the sides.
+
+.. figure:: m17-zipper_front_sides.jpg
+   :align: center
+
+Place the right side of the zipper on the right side of the front side
+panel (the thin one that is in one piece) and place the right side of
+its lining on top of both; sew so that thr zipper is sandwitched between
+the two layers and turn them inside out so that the zipper protudes.
+
+.. figure:: m18-zipper_back_sides.jpg
+   :align: center
+
+.. figure:: m19-zipper_attached.jpg
+   :align: center
+
+Place the right side of the zipper and assembled panel on the right side
+of the back side/top panel (the one assembled from the sides and top)
+and place the right side of its lining on top of both; sew as above and
+turn inside out.
+
+Insert the zipper pulls in the assembled top/sides.
+
+Baste the lining
+^^^^^^^^^^^^^^^^
+
+In this step we will attach all lining pieces to their fabric ones,
+wrong sides facing with a wide zig-zag stitch, so that they are easier
+to treat them as one while assembling the backpack and to prevent the
+raw edges from fraying before they are covered with tape.
+
+.. figure:: m20-flatlined_top_sides.jpg
+   :align: center
+
+Sew the lining and fabric of the top/side panels on the remaining raw
+edges.
+
+.. figure:: m21-flatlined_bottom.jpg
+   :align: center
+
+Sew the lining to fabric of the bottom panel.
+
+.. figure:: m22-insert_padding.jpg
+   :align: center
+
+.. figure:: m27-lined_front.jpg
+   :align: center
+
+Sandwitch the rigid padding between the lining and the fabric of the
+front panel, sew all around the edges.
+
+Sandwitch the rigid padding between the lining (including the pocket)
+and the fabric of the back panel, sew all around the edges.
+
+Assemble the backpack
+^^^^^^^^^^^^^^^^^^^^^
+
+.. figure:: m23-attached_shoulder_pads.jpg
+   :align: center
+
+.. figure:: m24-attached_strap_triangles.jpg
+   :align: center
+
+Sew the shoulder straps and the lower strap triangles to the back panel,
+1.5 cm from the edge.
+
+.. figure:: m25-assembled_sides_right_side.jpg
+   :align: center
+
+.. figure:: m26-assembled_sides_wrong_side.jpg
+   :align: center
+
+Place the bottom panel on the top/side panel, right (fabric) sides
+facing, sew on both short edges. Fingerpress the raw edges towards the
+bottom and bind them with twill webbing.
+
+.. figure:: m27-sides_and_back.jpg
+   :align: center
+
+.. figure:: m28-backpack_without_front.jpg
+   :align: center
+
+Place the right (fabric) side of the top/bottom/sides on the right side
+of the back, sew all around. You may have to clip the raw edges near the
+curves before sewing.
+
+Open a few centimeters of the zipper.
+
+Place the right (fabric) side of the top/bottom/sides on the right side
+of the front, sew all around. As above if needed clip the raw edges
+before sewing.
+
+Bind the remaining raw edges with the twill webbing (this will require
+two pieces of twill webbing 157 cm long).
+
+Turn the finished backpack inside-out, enjoy it and start planning
+accessories. :)