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authorElena ``of Valhalla'' Grandi <valhalla@trueelena.org>2022-01-16 10:23:52 +0100
committerElena ``of Valhalla'' Grandi <valhalla@trueelena.org>2022-01-16 10:23:52 +0100
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-Componible 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. :)