Foundation Backpack
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The Muscle Nation Foundation Backpack is designed to keep up with wherever the day takes you. With plenty of space for your gym gear, work essentials and everything in between, it's the everyday backpack you'll reach for on repeat. Designed with smart storage, comfortable padded straps and a carry-on friendly size, it's made for gym sessions, weekend trips and life on the go.
Product Details
Product Features
- Carry-on luggage size
- Dimensions: Width 34cm / Length 41cm / Depth 15cm
- Large main zipped compartment with internal pocket
- Padded ergonomic adjustable shoulder straps
- External zipped pocket for easy access
- Side pockets with elastic edge for drink bottles
- Top carry handle
- Muscle Nation print across the top
- 100% Polyester
Shipping & Returns
Returns
We hope you love your new items as much as we do! However, if you're not 100% satisfied with your purchase, we have a Returns Policy in place.
You may return full-price items for an exchange (either for the same item in a different size or a new item altogether), store credit, or a refund.
Please note that any items marked as "final sale" are not eligible for store credit or a refund, as outlined in our returns policy. However, final sale items can be exchanged for the same style and colour in a different size, subject to availability. If your desired size is unavailable, we appreciate your understanding that no return or further exchange can be processed.
Undergarments, socks and opened supplements are excluded from our returns policy and cannot be returned for hygiene reasons.
Find out more about our Returns Policy.
General Shipping Rates
Australia
New Zealand
USA, UK
Canada
Europe
All other countries
Shipping costs and delivery timeframes may vary per country, please enter your shipping address at checkout for specific rates.
Find out more about our Shipping Policy
Size Guide
Find your fit before you check out. Every measurement below is the garment laid flat — match it against a piece you already own, or measure your body and size to the closest range. Bodies are beautifully unique, so treat this as a guide.
Still unsure? Email orders@musclenation.org — our team will help you dial it in.
How to measure
Use a soft tape measure and keep it level. Measure over bare skin or close-fitting clothing for the truest reading.
Quick fit check
Enter your measurements to get a starting size for bottoms.
Bottoms & Leggings
Body measurements for all leggings, bike shorts, joggers and bottoms. Sizing runs XXS–XXXXL with AU equivalents.
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Inseam & Length
Inseam is the inner-leg seam length. Our Aura Straight Leg Leggings now come in three leg lengths — pick the one that matches your height.
Aura Straight Leg — inside leg by fit length
Short suits ~150–163cm, Regular ~163–175cm and Tall ~175–188cm. Inside leg is measured flat from the crotch seam to the hem.
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Aura Peachy — Rise
The Aura Peachy range comes in two rises. The High Rise waistband now sits 4cm higher than the Mid Rise for more coverage and core support.
Choose your rise
Both rises use the same buttery Aura Peachy fabric and sculpting scrunch — the only difference is how high the waistband sits.
Shorts — Inseam & Rise
Inseam length by short style. Use the bottoms chart above for waist & hip sizing.
Sports Bras
Measure around the fullest point of the bust and directly under the bust.
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Tees
Measured flat, not worn — match against a tee you already love. Oversized tees run a true super-oversized fit, so we don't recommend sizing up; size down for a less oversized look.
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How to measure
Use a soft tape measure and keep it level. Measure over bare skin or close-fitting clothing for the truest reading.
Quick fit check
Enter your measurements to get a starting size for tops & bottoms.
Bottoms
Shorts, joggers and bottoms. Body measurements, sizes S–XXXXL.
← Swipe table to see all columns →
Tops
Tees, tanks, singlets and hoodies. Body measurements, sizes S–XXXXL.
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Customers praised this versatile backpack for gym use, highlighting its spaciousness and organizational features. One customer noted it has "so much room and pockets." All reviews gave 5-star ratings, showing high satisfaction with storage capacity and functionality for fitness activities.
- Very happy with this gym bag its got so much room and pockets
Size and quality are good for the price. Good
Gym bag
Brought for my daughter. It for her birthday 🎂 so I have to wait till September. I know she is going to love it 💜:hands_heart_medium_skin_tone:✨
Great size bag, fits everything i need for the gym.
Super lightweight backpack with heaps of storage room. Great for school, the gym or just everyday use. Love the colour.
Very happy with this gym bag its got so much room and pockets
Love this bag. Fits my laptop lunch and water bottle
Great backpack, compact and right size for gym gear
Great bag, compact and right size for gym gear
It’s a good little backpack, ironically more suited as a day pack when out and about than it is for the gym, mostly because I need something bigger for the gym with all the stuff I take! But that said, it was a freebie in the EOFY sale so definitely not complaining!
Great size, nice fabric and colour
Great size and light with enough pockets for a quick gym bag. Quality is great for the price.
Loving this bag. This bag is my go-to to the gym, uni or even my everyday outing. The size, colour and the amount of pockets it has is amazing.
Love love this quality is great and the size is perfect I use this for day trips with the kids and packs everything I need for three kids
Perfect for gym and every day use. Good size
I have been usong my backpack everyday to go to the gym. It has the perfect size for my towel and gym gear. The colour is a beautiful light pink. When i first got it i didn’t think it was very strong, bit i was wrong, it is a great quality, very strong.
Matches my drink bottle , thanks MN This is coming on my next holiday to Samoa in June
Good little gym bag, easy value for money.
Simple but good quality backpack. There is an inner pocket for a laptop, a small zipped outer pouch, plus two outside side pocket.
Great backpack! Awesome free gift!
Nice bag
Great simple backpack. Even better when its free!
This bag is perfect! Perfect size for work and fits what i need in it
Very good quality! I have all my bits and pieces for pilates, my heavy drink bottle and I pack my purse, keys, phone and sunnies inside the back part so I dont need to take a handbag as well. Also looks bloody awesome so got one for my best friend too, she loves it and uses hers for work.
Hubby very happy with the size, fits his large runners and clothes for the gym.
I like how easy it is to use. I brought a 2nd one to have as well