{"id":701,"date":"2020-10-02T05:36:44","date_gmt":"2020-10-02T10:36:44","guid":{"rendered":"http:\/\/santiagoinlove.com\/en\/?p=701"},"modified":"2020-10-02T05:36:45","modified_gmt":"2020-10-02T10:36:45","slug":"myth-backpack-ideal-weight-10-percent","status":"publish","type":"post","link":"https:\/\/santiagoinlove.com\/en\/myth-backpack-ideal-weight-10-percent\/","title":{"rendered":"Myth: backpack ideal weight and the 10% rule"},"content":{"rendered":"\n<p>Who has never heard of the famous <strong>&#8220;10% rule&#8221;<\/strong>? It&#8217;s everywhere, pretty hard to escape it\u2026 Yet <strong>as it is, this rule is <em>wrong<\/em>!<\/strong> Yep yep, you read it right. Wrong! What? Have people been lying to you? Is there a secret conspiracy targeting pilgrims&#8217; backs? Well, not exactly\u2026<\/p>\n\n\n\n<p>Let me explain <strong>why<\/strong> the &#8220;10% rule&#8221; is a myth\u2026 and <strong>what to do to use it properly!<\/strong><\/p>\n\n\n\n<!--more-->\n\n\n\n\n\n<p style=\"text-align: center\">\n<a href=\"#rule10-what\">What is the 10% rule?<\/a><br>\n<a href=\"#rule10-logic\">The 10% rule is wrong&#8230; and it&#8217;s logical it is!<\/a><br>\n<a href=\"#rule10-detail\">The detail that makes all the difference<\/a><br>\n<a href=\"#rule10-now\">What now?<\/a><br>\n<a href=\"#rule10-suggestion\">A personal suggestion<\/a>\n<\/p>\n\n\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" src=\"http:\/\/santiagoinlove.com\/en\/wp-content\/uploads\/sites\/3\/2020\/10\/regle-10.jpeg\" alt=\"10% rule to find your backpack's ideal weight - Santiago in Love\" class=\"wp-image-704\" width=\"750\" height=\"562\" srcset=\"https:\/\/santiagoinlove.com\/en\/wp-content\/uploads\/sites\/3\/2020\/10\/regle-10.jpeg 750w, https:\/\/santiagoinlove.com\/en\/wp-content\/uploads\/sites\/3\/2020\/10\/regle-10-300x225.jpeg 300w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><\/figure><\/div>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 id=\"rule10-what\">What is the 10% rule?<\/h2>\n\n\n\n<p>When it comes <strong>to know how much a backpack should weigh<\/strong>, BINGO! The 10% rule appears. I don&#8217;t know where this &#8220;rule&#8221; comes from, but what&#8217;s certain is, we hear about it everywhere. Between pilgrims on the Camino, in books, on social medias\u2026 impossible to cut it!<\/p>\n\n\n\n<p>The formula is simple: <strong>a backpack must weigh a maximum of 10% of the weight of the person who carries it<\/strong>. Take the weight of a person, multiply it  by 10, take the result and divide by 100: the result is the maximum weight that person&#8217;s backpack should be. Said in math language: <strong>(Kgx10):100= max weight of the bag<\/strong>. Works with pounds all the same! Since a picture weighs 1000 words (haha!), I&#8217;ll spare you more blah blah and math to show you directly what it looks like:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" src=\"http:\/\/santiagoinlove.com\/fr\/wp-content\/uploads\/sites\/2\/2020\/10\/Regle-10-scale.jpg\" alt=\"R\u00e8gle des 10% calculer le poids id\u00e9al du sac\" class=\"wp-image-1191\" width=\"462\" height=\"563\"\/><figcaption>Chart on the Camino &#8220;helping&#8221; pilgrims to find their pack&#8217;s maximum weight<\/figcaption><\/figure><\/div>\n\n\n\n<p>Your sharp eye will have noticed that the photo shows calculations made for 15 and 20% of someone&#8217;s weight. <strong>The formula and its principle are the same, even though pilgrims usually do calculations with 10%<\/strong> (well&#8230; it <em>is <\/em>easier!). In any case, we find ourselves with:<\/p>\n\n\n\n<ul><li>on the left, the person&#8217;s weight<\/li><li>in the middle and on the right, the maximum weight that person&#8217;s bag should be, for 15 and 20% of that person&#8217;s weight<\/li><li><strong>as an example:<\/strong> a person who weighs 40kg\/88lb can carry a maximum of 6kg\/13lb (rule for 15% of the weight) or 8kg\/17.5lb (rule for 20% of the weight). Or 4kg\/8.8 max, if we use 10% of the weight!<\/li><\/ul>\n\n\n\n<p>Well now, <strong>in theory\u2026 it should click! Otherwise, no problem, keep reading, I&#8217;ll explain \ud83d\ude09<\/strong><\/p>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 id=\"rule10-logic\">The 10% rule is wrong&#8230; and it&#8217;s logical it is!<\/h2>\n\n\n\n<p>Let&#8217;s illustrate the problem with an example. Let&#8217;s imagine someone <em>completely<\/em> at random*: James. For his 1st Camino, <strong>James weighs 70kg\/155lb<\/strong> (dripping wet). Following the advice he received to the letter (on Facebook or elsewhere, we can&#8217;t say), James is forced to limit the weight of his <strong>bag to 7kg\/15.5lb<\/strong>. &#8220;10% rule&#8221; rules! It&#8217;s really though, but James succeeds and arrives radiant in Santiago. Then he goes back home. And then bummer! Depressed not to be on the Camino anymore, James comforts himself with sweets and drowns himself into his desk job. <strong>James gains 50kg\/110lb<\/strong> before he can free some time up to leave again for another Camino.<\/p>\n\n\n\n<p><strong>He now weights 120kg\/265lb<\/strong>, James begins his preparations and O Joy! He realizes after some quick calculations that this time, he can pack <strong>a 12kg\/26.5lb bag<\/strong>! &#8220;10% rule&#8221; rules! With pleasure, James allows himself to take a toothbrush <em>with <\/em>a handle and a second underwear. And a few other things. A long time before arriving in Santiago (in fact, from the very 1st day), <strong>Jacques has a hard time carrying his backpack<\/strong>\u2026 He racks his brain but he doesn&#8217;t get it\u2026 <strong>His bag is exactly 10% of his weight!<\/strong> What&#8217;s going on???<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" width=\"750\" height=\"530\" src=\"http:\/\/santiagoinlove.com\/en\/wp-content\/uploads\/sites\/3\/2020\/10\/regele-10-jacques.jpg\" alt=\"10% rule to calculate the maximal weight of a backpack is wrong! Santiago in Love\" class=\"wp-image-705\" srcset=\"https:\/\/santiagoinlove.com\/en\/wp-content\/uploads\/sites\/3\/2020\/10\/regele-10-jacques.jpg 750w, https:\/\/santiagoinlove.com\/en\/wp-content\/uploads\/sites\/3\/2020\/10\/regele-10-jacques-300x212.jpg 300w\" sizes=\"(max-width: 750px) 100vw, 750px\" \/><figcaption>On the left, a happy James. On the right, a very puzzled James with his monster backpack&#8230; What happened???<br><em>Drawing: Marion for Santiago in Love &#8211; CC BY-S1-NC<\/em><\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"has-text-align-center\"><strong>And you? Could you explain to James what went wrong this second time? \ud83d\ude09<\/strong><\/p>\n\n\n\n<p>Maybe you&#8217;re like me and math isn&#8217;t your thing. Or maybe riddles of logic kill your neurons. Thankfully in this case, we don&#8217;t need to be a black belt in chess or Rubik&#8217;s cube to figure it out! <strong>Calculations are good, problems rise when we apply it in real life<\/strong>. As it&#8217;s stated, the 10% rule implies that <strong>the heavier you are, the more weight you can carry<\/strong>. And we can see it clearly with the chart on the picture above: <strong>the heavier you are, the heavier your backpack becomes<\/strong>.<\/p>\n\n\n\n<p>And <strong>here&#8217;s the rub<\/strong>, because this result is completely counter-productive!<\/p>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 id=\"rule10-detail\">The detail that makes all the difference<\/h2>\n\n\n\n<p>I said right above that calculations were good but their practical applications were bad. Okay. <strong>Something else&#8217;s wrong too: the numbers we use.<\/strong> <span style=\"text-decoration: underline;\">As it&#8217;s stated<\/span>, 10% rule is based on a person&#8217;s weight. If we want to use this formula as a reference, <strong>we should base it on the person&#8217;s <span style=\"text-decoration: underline;\">health weight<\/span> for it to be effective<\/strong>. Health, or fit, or ideal weight. Can you see the difference it makes to use this new number?<\/p>\n\n\n\n<p>In the previous example, James&#8217; weight was <strong>70kg\/155lb<\/strong> on his 1st Camino. <strong>This was his health weight<\/strong>. For his 2nd Camino, James has not changed his health weight: it&#8217;s <strong>still 70kg\/155lb<\/strong>. However he is now <strong>50kg\/110lb <span style=\"text-decoration: underline;\">over<\/span>weight, which should not count when calculating the weight of his pack!<\/strong> Because<strong> to be overweight doesn&#8217;t mean you can carry more weight<\/strong>. It would rather mean that, since you already carry extra weight <span style=\"text-decoration: underline;\">on you<\/span>, you should carry less in your bag! Eventually and according to the adjusted 10% rule, James <strong>should have left with a 7kg\/15.5lb bag<\/strong>!<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" src=\"http:\/\/santiagoinlove.com\/en\/wp-content\/uploads\/sites\/3\/2020\/10\/regele-10-jacques2.jpg\" alt=\"Adjusted 10% rule and backpack ideal weight - Santiago in Love\" class=\"wp-image-706\" width=\"334\" height=\"375\" srcset=\"https:\/\/santiagoinlove.com\/en\/wp-content\/uploads\/sites\/3\/2020\/10\/regele-10-jacques2.jpg 668w, https:\/\/santiagoinlove.com\/en\/wp-content\/uploads\/sites\/3\/2020\/10\/regele-10-jacques2-267x300.jpg 267w\" sizes=\"(max-width: 334px) 100vw, 334px\" \/><figcaption>With the <strong>new 10% rule<\/strong>, James only <strong>carries a 7kg\/15.5lb backpack<\/strong>&#8230; and it suits him well!<br><em>Drawing: Marion for Santiago in Love &#8211; CC BY-SA-NC<\/em><\/figcaption><\/figure><\/div>\n\n\n\n<p><strong>The 10% rule should therefore be applied differently<\/strong>. We should stop using people&#8217;s weight, but <strong>use their health weight<\/strong>. It can be found with diet-specific calculations (BMI, ideal weight, etc.) or with charts available in books or on the Internet. Health weight varies greatly from one person to the next and depends on height and stature (and other stuffs). It is generally between 40 and 80 kg\/88-175lb for women and between 50 and 90 kg\/ 110-200lb for men. <strong>If we apply the adjusted 10% rule, results gives us backpacks weighing between 4 and 8kg \/9 and 17.5lb for women; between 5 and 9kg\/11 and 20lb for men<\/strong>\u2026 We are very far from the figures suggested on the chart of the picture!<\/p>\n\n\n\n<p>Overall conclusion to remember: <span style=\"text-decoration: underline;\">used correctly<\/span>, the 10% rule shows us that <strong>a bag should weigh less than 10kg\/20lb<\/strong>.<\/p>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 id=\"rule10-now\">What now?<\/h2>\n\n\n\n<p>After all we&#8217;ve talked about together, you can easily guess! If you want to use the 10% rule, <strong>use it correctly<\/strong>. Make sure you find your health weight first\u2026 and use it for your calculations!<\/p>\n\n\n\n<p>Also keep in mind that <strong>this 10% rule is purely informative AND rough<\/strong>. It&#8217;s used to get an idea of the weight of the backpack, but it&#8217;s not a goal to reach at all cost. <strong>If you&#8217;re below it, well done, that&#8217;s great! If you&#8217;re above, that&#8217;s probably ok too<\/strong>. Humans are able to carry impressive loads! But since not everyone is a Sherpa, just make sure you<strong> reach a weight you can carry without harm<\/strong>. Based on the conclusions we just drew above, think that <strong>below 10kg\/20lb, your bag is pretty good!<\/strong><\/p>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 id=\"rule10-suggestion\">A personal suggestion&#8230;<\/h2>\n\n\n\n<p>To me, <strong>using the 10% rule is not worth it (even readjusted)<\/strong>\u2026 What, wait? How can I say that after a whole post on the subject?!? Well&#8230; let me explain \ud83d\ude09<\/p>\n\n\n\n<ul><li>First because obviously, almost <strong>nobody uses this formula correctly<\/strong> \u2026 Although not you anymore, congrats!<\/li><li>Second, because before we can use it correctly, we have to <strong>go through complicated calculations that give arbitrary results anyways<\/strong>. Health weight varies a lot from one person to another and it depends on a whole bunch of things. Plus, health weight is not a precise number, but moves within a range!<\/li><li>Also, depending who&#8217;s talking about it, <strong>the reference changes<\/strong>. People use  10%, 15% or 20%. Mostly 10%, just because it&#8217;s easier to do math with. There&#8217;s <strong>nothing scientific about it<\/strong>.<\/li><li>Even when used properly from start to finish, <strong>it gives us unreliable results<\/strong>. What people can carry also varies a lot from one person to another and it also depends a whole bunch of things.<\/li><li>It also makes <strong>people feel guilty and stressed<\/strong> about their pack&#8217;s weight\u2026<\/li><li>Last but not least, because to me, the less math, the better \ud83d\ude09<\/li><\/ul>\n\n\n\n<p>Anyways, one thing is certain under all circumstances: <strong>lighter bags are easier and more comfortable to carry<\/strong>! Why bother with the 10% rule? I suggest instead a new directive: <strong>&#8220;the lighter the better!&#8221;<\/strong> Less than 10kg\/20lb is good, but <strong>let&#8217;s always try to make our packs as light as possible<\/strong>. It takes time, thoughts, trials, (re)adjustments\u2026 and it&#8217;s a never-ending process! <a href=\"http:\/\/santiagoinlove.com\/en\/tip-reduce-your-equipment\/\">Here&#8217;s some place to start<\/a>&#8230;<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" src=\"http:\/\/santiagoinlove.com\/en\/wp-content\/uploads\/sites\/3\/2020\/10\/regele-10-sac.jpg\" alt=\"\" class=\"wp-image-709\" width=\"250\" height=\"250\" srcset=\"https:\/\/santiagoinlove.com\/en\/wp-content\/uploads\/sites\/3\/2020\/10\/regele-10-sac.jpg 500w, https:\/\/santiagoinlove.com\/en\/wp-content\/uploads\/sites\/3\/2020\/10\/regele-10-sac-300x300.jpg 300w, https:\/\/santiagoinlove.com\/en\/wp-content\/uploads\/sites\/3\/2020\/10\/regele-10-sac-150x150.jpg 150w\" sizes=\"(max-width: 250px) 100vw, 250px\" \/><figcaption>Less than 10kg\/20lb is good but&#8230; <strong>the lighter, the better!<\/strong><br><em>Drawing: Marion for Santiago in Love &#8211; CC BY-SA-NC<\/em><\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"has-text-align-center\"><strong>Happy preps and good luck, may your backpack be as light as can be!<\/strong><\/p>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>*The character and situations portrayed in this examples are fictitious. Identification with actual persons who would feel targeted was not intended and shouldn&#8217;t be inferred \ud83d\ude09<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Who has never heard of the famous &#8220;10% rule&#8221;? It&#8217;s everywhere, pretty hard to escape it\u2026 Yet as it is, this rule is wrong! Yep yep, you read it right. Wrong! What? Have people been lying to you? Is there a secret conspiracy targeting pilgrims&#8217; backs? Well, not exactly\u2026 Let me explain why the &#8220;10% &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/santiagoinlove.com\/en\/myth-backpack-ideal-weight-10-percent\/\"> <span class=\"screen-reader-text\">Myth: backpack ideal weight and the 10% rule<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":704,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"categories":[232],"tags":[20,149,141,195,142,147,312,248,313],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Myth: backpack ideal weight and the 10% rule - Santiago in Love<\/title>\n<meta name=\"description\" content=\"Awww the famous 10% rule! 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