{"product_id":"engineer-by-day-ninja-by-night-tumbler-funny-engineer-gift","title":"Funny Engineer Gifts from Men to Friends - Engineer By Day. Ninja By Night. - 20oz or 30oz Tumbler for Mother's Day","description":"\u003cp\u003eThis \u003cstrong\u003efunny engineer tumbler\u003c\/strong\u003e features the quote \u003cem\u003e\"Engineer By Day. Ninja By Night.\"\u003c\/em\u003e on a black vacuum-insulated stainless steel body — available in 20oz ($34.95) or 30oz ($39.95), with a powder coat finish built for daily use on the job site, in the office, or anywhere in between. A specific, practical gift for any engineer who operates at a level most people don't see.\u003c\/p\u003e\u003cp\u003eEngineers solve problems that other people don't know exist. This tumbler acknowledges that duality — the professional precision they bring to every project, and the behind-the-scenes competence that doesn't make it onto any org chart. The \u003cstrong\u003evacuum insulation\u003c\/strong\u003e keeps hot drinks hot and cold drinks cold, the \u003cstrong\u003estainless steel construction\u003c\/strong\u003e handles the demands of a full workday, and the quote does the rest.\u003c\/p\u003e\u003cblockquote\u003e\"Engineer By Day. Ninja By Night.\"\u003c\/blockquote\u003e\u003ch2\u003eTumbler Specs and Construction\u003c\/h2\u003e\u003cp\u003eThe tumbler is built from \u003cstrong\u003estainless steel\u003c\/strong\u003e with a \u003cstrong\u003epowder coat finish\u003c\/strong\u003e in black — durable, grip-friendly, and resistant to scratches under normal daily use. The double-wall vacuum insulation keeps beverages at temperature for extended periods, making it practical for long site visits, commutes, or desk use. Hand wash only for best results to preserve both the insulation performance and the printed design.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSizes:\u003c\/strong\u003e 20oz ($34.95) or 30oz ($39.95) — same quote and construction, more capacity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Stainless steel with powder coat finish — Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation:\u003c\/strong\u003e Double-wall vacuum — keeps hot drinks hot, cold drinks cold\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrint:\u003c\/strong\u003e \"Engineer By Day. Ninja By Night.\" on one side\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCare:\u003c\/strong\u003e Hand wash recommended for best results\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eChoosing Your Size\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003e20oz\u003c\/strong\u003e is the right call for engineers who prefer a standard travel tumbler size — easy to carry, fits most cup holders, and handles a full morning's worth of coffee. The \u003cstrong\u003e30oz\u003c\/strong\u003e suits anyone who works long shifts, prefers not to refill, or drinks slowly and wants the temperature to hold throughout the day. Both sizes display the same quote and use identical stainless steel vacuum construction.\u003c\/p\u003e\u003ch2\u003eWho This Gift Is For\u003c\/h2\u003e\u003cp\u003eThis tumbler was made for the engineer who puts in the hours and rarely gets acknowledged for it. It works for mechanical engineers, civil engineers, electrical engineers, software engineers, aerospace engineers, and any professional who carries the title. The quote is profession-specific rather than generic, which is what makes it a gift worth giving — and worth keeping.\u003c\/p\u003e\u003cp\u003eIdeal gifting occasions include:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBirthdays and work anniversaries at any career stage\u003c\/li\u003e\n\u003cli\u003eGraduation gifts for new engineers entering the field\u003c\/li\u003e\n\u003cli\u003eMother's Day and Father's Day for engineer parents\u003c\/li\u003e\n\u003cli\u003eChristmas and holiday gift exchanges\u003c\/li\u003e\n\u003cli\u003eAppreciation gifts from a team, manager, or collaborator\u003c\/li\u003e\n\u003cli\u003eJust-because gifts that actually name what the recipient does\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eA Tumbler That Earns Its Place on the Desk\u003c\/h2\u003e\u003cp\u003eGeneric tumblers get forgotten in the cabinet. This one earns a permanent spot because the quote is specific enough to feel personal and the vacuum insulation is practical enough to reach for every morning. The powder coat finish keeps it looking sharp through the demands of a full workday, and the black colorway works equally well in the office or on the job site.\u003c\/p\u003e\u003cp\u003eBrowse the full \u003ca href=\"\/collections\/tumblers-for-engineers\" style=\"color:#00AAFF;text-decoration:underline;font-weight:bold;\"\u003etumblers for engineers\u003c\/a\u003e collection for additional styles, or explore all \u003ca href=\"\/collections\/gifts-for-engineers\" style=\"color:#00AAFF;text-decoration:underline;font-weight:bold;\"\u003egifts for engineers\u003c\/a\u003e to build a complete gift set. For a coordinated holiday gift, the \u003ca href=\"\/collections\/ornaments-for-engineers\" style=\"color:#00AAFF;text-decoration:underline;font-weight:bold;\"\u003eornaments for engineers\u003c\/a\u003e collection pairs well with this tumbler.\u003c\/p\u003e\u003cstyle\u003edetails.vtv-faq{border-bottom:1px solid #e0e0e0;padding:12px 0;}details.vtv-faq summary{cursor:pointer;font-weight:600;list-style:none;display:flex;justify-content:space-between;align-items:center;padding-right:4px;}details.vtv-faq summary::-webkit-details-marker{display:none;}details.vtv-faq summary::after{content:'+';color:#00AAFF;font-size:1.25em;font-weight:700;flex-shrink:0;margin-left:12px;}details.vtv-faq[open] summary::after{content:'−';}details.vtv-faq p{margin:10px 0 4px;}\u003c\/style\u003e\u003cdetails class=\"vtv-faq\"\u003e\u003csummary\u003eWhat sizes does this tumbler come in?\u003c\/summary\u003e\u003cp\u003eThe engineer tumbler is available in 20oz at $34.95 and 30oz at $39.95. Both feature the same \"Engineer By Day. Ninja By Night.\" quote on a black stainless steel body with vacuum insulation and powder coat finish. The 20oz is a standard travel size. The 30oz is better for longer shifts or anyone who prefers not to refill mid-day.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails class=\"vtv-faq\"\u003e\u003csummary\u003eDoes this tumbler keep drinks hot and cold?\u003c\/summary\u003e\u003cp\u003eYes — the tumbler uses double-wall vacuum insulation to keep hot drinks hot and cold drinks cold for extended periods. This makes it practical for long commutes, job site visits, or full-day desk use where reheating or refilling isn't always convenient. Both the 20oz and 30oz sizes use the same insulation construction.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails class=\"vtv-faq\"\u003e\u003csummary\u003eWhat is the tumbler made from?\u003c\/summary\u003e\u003cp\u003eThe tumbler is made from stainless steel with a powder coat finish in black. The stainless steel body provides durability for daily use, and the powder coat finish is grip-friendly and scratch-resistant under normal conditions. The double-wall vacuum construction sits between the inner and outer stainless steel walls.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails class=\"vtv-faq\"\u003e\u003csummary\u003eIs the tumbler dishwasher safe?\u003c\/summary\u003e\u003cp\u003eHand wash is recommended for best results. Dishwashers can degrade the vacuum insulation performance and wear down the printed design over time. Washing by hand with warm water and mild soap preserves both the tumbler's temperature retention and the \"Engineer By Day. Ninja By Night.\" print for long-term daily use.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails class=\"vtv-faq\"\u003e\u003csummary\u003eWhat types of engineers is this tumbler for?\u003c\/summary\u003e\u003cp\u003eThe tumbler suits any professional who carries the engineer title — mechanical engineers, civil engineers, electrical engineers, software engineers, aerospace engineers, and beyond. The quote \"Engineer By Day. Ninja By Night.\" speaks to the profession itself rather than a specific engineering discipline, making it a versatile gift across all fields.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails class=\"vtv-faq\"\u003e\u003csummary\u003eWhat quote is on the tumbler?\u003c\/summary\u003e\u003cp\u003eThe tumbler features the quote \"Engineer By Day. Ninja By Night.\" printed on one side of the black stainless steel body. It is occupation-specific rather than a generic motivational phrase — acknowledging both the engineer's professional identity and the behind-the-scenes competence that defines the role.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails class=\"vtv-faq\"\u003e\u003csummary\u003eWhich size should I choose — 20oz or 30oz?\u003c\/summary\u003e\u003cp\u003eChoose the 20oz if the recipient prefers a standard travel tumbler that fits most cup holders and handles a typical morning of coffee. Choose the 30oz if they work long shifts, drink slowly throughout the day, or prefer not to refill. Both sizes feature the same quote, construction, and vacuum insulation — the only difference is capacity.\u003c\/p\u003e\u003c\/details\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Product\",\"name\":\"Funny Engineer Gifts from Men to Friends - Engineer By Day. 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