Gallery Video Directory Hammock Articles Donate Hammock Forums Store Today's Posts Mark Forums Read
 Hammock Forums - Elevate Your Perspective Making a Stuff Sack to an Exact Size Tutorial
 Home Forums Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

 09-17-2010, 16:34 #1 nacra533 Senior Member     Join Date: May 2009 Location: Hartwell, GA Hammock: DIY dbl 1.1 Tarp: DIY hex Insulation: DIY 3 season tq+uq Suspension: webbing, again View my gallery 26 Posts: 620 Images: 26 Making a Stuff Sack to an Exact Size Tutorial Making a stuff sack to a specific size can be a challenge. It’s pretty easy if you make a round bottom stuff sack, but can be confusing if making a square/rectangular bottom one. It’s also difficult to determine the size of a square bottom sack you can make with a piece of scrap material. In this tutorial, I will hopefully demonstrate how to make a square/rectangular bottom stuff sack to a specific size. I typically make square bottom stuff sacks, but will show a rectangular version in an effort to make the example less confusing. I am assuming that you already know how to sew a square bottom stuff sack and you have a preferred method of installing the drawstring channel. Whatever method you use, just account for it in the CSA (channel seam allowance). This method use the following process which is similar to the one on thru-hiker.net: -Fold the fabric in half length wise. -Stitch the sides together (plan for your preferred drawstring channel). The fold becomes the bottom of the sack. The stitch lines are the sides. -Sew the drawstring channel. -Form and stitch the square/rectangular bottom, by pulling out the “corners” Let’s assume we want a 200 cubic inch stuff sack. Its finished size will be 10” tall with a 5”x4” rectangular bottom. It will have a draw string channel to close the bag. To calculate the blank of material you need to start with, I use this formula. Height of Fabric Blank = 2*H + y + 2*CSA Width of Fabric Blank = x + y + 2*SA In this example: H=10” (height of bag) x=5” (bottom) y=4” (bottom) SA = ˝” (side seam allowance) CSA = 1-1/2” (draw string channel seam allowance) (I should have used larger, but didn’t want to redraw the picture) Blank should be 27” tall x 10” wide For a square bottom sack, x = y What if I just have a scrap piece and want to know if it's big enough? If you already have a scrap of fabric and you want to know what size you can make, solve it backwards and make it a square bottom. For example, a 24x9” piece. Again, for a square bottom Max width (x) = (Fabric width - 2*SA) / 2. Sack height (H) = (height of fabric blank – y – 2*CSA) / 2 x = y = 4" for a square bottom. Sack height (H) = 8.5" Also, if you always use 1/2" seam allowance, x = (Fabric width - 1") / 2 assuming height of blank is 24” width of blank is 9” CSA = 1.5” So you can make an 8.5” stuff sack with a 4x4 bottom I like a 4x4 square bottom for things like hammocks, tarps, etc.. For larger items, figure out the rectangular bottom size you need. A discussion on a confusing part. Why is the bottom height (y) included in the sack width? (y = 4 for the example) Because it’s folded on the center, you have 2” on each side of the centerline fold. When you pull out the corners to form the bottom, it forms a 45 degree triangle. From geometry of a 45 degree triangle. Base = Height. Hypotenuse doesn’t matter. I know the triangle height is half of the y dimension, so the base is also ˝ of the y dimension. Clear as mud?
 09-17-2010, 19:39 #2 BurningCedar     Join Date: May 2007 Location: Missouri Hammock: Warbonnet BB Tarp: MacCat or SWT Insulation: Yeti or JRB Quilt Suspension: Whoopie Sling View my gallery 9 Posts: 548 Images: 9 Thanks! This is really helpful as I've struggled with sewing stuff sacks to fit a specific application. I've bookmarked this page for future reference. __________________ David The road goes ever on and on Down from the door where it began. Now far ahead the Road has gone, And I must follow, if I can, Pursuing it with weary feet, Until it joins some larger way, Where many paths and errands meet. And whither then? I cannot say. -Frodo Baggins, The Fellowship of the Ring
 09-17-2010, 19:44 #3 Poppabear     Join Date: Dec 2009 Location: Lexington Park, MD Hammock: Warbonnet Blackbird 1.7 Tarp: Zpacks Cuben Fiber Insulation: Leigh's UQ Suspension: Whoopies/Treestrap Posts: 2,676 Very nice tutorial thanks for taking the time to post it. I've got it bookmarked for future reference. __________________ Terry
 01-28-2012, 12:21 #4 -Sasquatch- Member   Join Date: Jan 2012 Location: Mountain City, GA Hammock: ENO DN Tarp: DYI Insulation: DYI Underquilt Suspension: Whoopies Posts: 59 Thanks for this! I'm heading to Colombia in a month and want to bring a backpack small enough to satisfy the carry-on diminsions the airline enforces. My other bags are either too big for the carry-on, or too small to carry my stuff...so I'll just make a backpack to the perfect size! This math will help me figure out the measurements for the body of my pack, the rest will be easy!
 01-28-2012, 14:15 #5 jwright   Join Date: May 2011 Location: Maryland Hammock: WBBB, DIY: 10', 11' Tarp: WB Edge/Superfly Insulation: DIY, Incubator Suspension: Whoopies + Dutch Posts: 683 Nacra-- This is awesome. The formulas and the very well labeled pictures makes this a snap to visualize and understand. Thanks a ton for posting this. Now if we can just get it formatted into a poster/page all will be well in the world. thanks again, jason
 01-29-2012, 13:15 #6 Lost_Biker     Join Date: Jan 2011 Location: Indiana Hammock: DIY Digi Camo DL Tarp: Maxi Tarp Insulation: Underquilts Lewis Suspension: Rings and Straps View my gallery 48 Posts: 2,134 Images: 48 Great info - thanks a bunch. All us noobs need all the help we can get.
 01-29-2012, 13:19 #7 thegreatjesse Senior Member     Join Date: Sep 2010 Location: Portland, OR Hammock: DIY - HH - ENO Tarp: OES - HG Insulation: DIY - HG Suspension: WS - AHE View my gallery 12 Posts: 258 Images: 12 I barely passed Math 110 with a D... but I understand this! Thanks! __________________ facebooks Gear List
 01-29-2012, 21:48 #8 Puncture New Member   Join Date: Jun 2010 Location: TN. Posts: 8 I used this to make stuff sacks for 2 hammocks on Friday. They came out great if you overlook the sewing. Thanks for posting it Nacra533.
 01-30-2012, 07:22 #9 TZBrown     Join Date: Jul 2008 Location: Fenton, Michigan Hammock: DIY and Speer Tarp: HG CF, MacCat, GG Insulation: HG,JRB,Speer,UGQ Suspension: straps & whoopies Posts: 1,592 This is good, Thanks for sharing __________________ Life's A Journey It's not to arrive safely at the grave in a well preserved body, But rather to skid in sideways, totally worn out, shouting, Woo Hoo!....What a Ride! My PHOTOS My VIDEOS
 01-30-2012, 08:35 #10 flying_bobo Member     Join Date: Jan 2011 Location: Valparaiso, IN Hammock: DIY DL & HH DeluxExplorer Tarp: DIY 4seas cat cut Insulation: DIY,UQ&TQ,HHSS,Pad Suspension: whoopies Posts: 66 Nice, I will be using this! __________________ Live simply,love generously, care deeply, speek kindly and leave the rest to God!

 Bookmarks

 Tags square bottom, stuff sack

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Site Topics     Introduce Yourself     Announcements     Feedback and suggestions     Articles Hammock Camping     General Hammock Talk         Long distance travel with a hammock     Suspension Systems, Ridgelines, & Bug Nets     Top Insulation     Bottom Insulation         Pads         Under Quilts     Weather Protection     Do-It-Yourself (DIY)         Fabrics         DIY Stickies Outings     Hangouts, Campouts, and Trip Planning         Northeast         Southeast         Midwest         Southwest         West         All Others     Trip Reports Marketplace     For Sale         Group Buys         Pay it Forward         [SOLD] items no longer available     For Trade         [TRADED] Items no longer available     Want to Buy Hammock Gear - Manufacturers and Services     Reviews     Other Vendors and Services     Arrowhead Equipment (Home of Kick Ass Quilts)     Butt in a Sling Hammock Gear     Clark Jungle Hammocks     Claytor Hammocks     DD Hammocks     Dream Hammock     Dutchware     Eagles Nest Hammocks     Grand Trunk     Hammock Gear     Hennessy Hammocks     2QZQ Hammock Specialties (Hennessy Bugnet Zipper Mods)     Jacks-R-Better     Molly Mac Gear     OES Tarps     Tree to Tree Trail Gear         Speer Hammocks     Trek Light Gear     UGQ Outdoor Equipment     Warbonnet Hammocks     Whoopie Slings     Wilderness Logics

All times are GMT -5. The time now is 02:40.