Last updated: March 2026
Enter your item dimensions and bag size to check the fit — backpacks, duffels, and tote bags.
Whether it fits depends on measurements most people get wrong.
Item dimensions vs. bag interior dimensions and opening size
Item: Varies — measure your specific item
Space: Daypack: ~20L. Weekend: ~40L. Travel: ~60L. Expedition: ~80L+
Actual clear openings are usually 1–2″ smaller than the labeled size.
Your exact dimensions probably aren't "standard." Small measurement errors cause big problems — 1 inch can be the difference between fitting and getting stuck.
Verdicts are calculated by comparing all 6 item orientations against the space dimensions using verified building code standards. See our methodology
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1 inch can be the difference between fitting and getting stuck.
“Checked my carry-on against 3 airlines before a trip. Saved me a gate-check fee.” — Frequent flyer
Measurements verified by the ItemFits engineering team · Our methodology
Standard sizes say it works — but your measurements are what matter.
Install the free ItemFits extension — it reads product dimensions on IKEA, Wayfair, Amazon and tells you if it fits before you buy.
A 15" laptop needs a bag with an interior depth of at least 15" and a laptop sleeve at least 10.5" wide. Most 25–30L backpacks fit 15" laptops. Check for a dedicated laptop compartment with padding.
Liters measure volume, not specific dimensions. A 40L bag could be tall and narrow (backpack) or short and wide (duffel). Always check the specific length × width × height measurements for rigid items.
A 60L duffel typically measures about 26" × 14" × 14" and fits a weekend's worth of clothes, shoes, toiletries, and a jacket. It's the standard gym bag or short-trip size.