Mission EXP Hip Pack - 4.5L
The GraylMission EXP Hip Pack is a modular waist pack built for travel, hiking, overlanding, and everyday carry. Offering 4.5 liters of organized storage with the ability to expand to 6.5 liters, it provides a compact carry solution without sacrificing accessibility or versatility.
Designed around Grayl's BottleDrop™ and BottleLock® systems, the Mission EXP securely carries your GeoPress®, UltraPress®, or other water bottles while maintaining quick access on the move. Combined with customizable internal organization, MOLLE compatibility, and recycled performance materials, it is equally at home on the trail, in the city, or during international travel.
"A prudent person foresees danger ahead and takes precautions. The simpleton goes blindly on and suffers the consequences. - Proverbs 27:12"
Durable Recycled Fabric
500D & 1000D coated nylon outer shell, bluesign® approved.
Expanse BottleDrop™ Pockets
Dual stretch pockets fit GRAYL bottles, windbreakers, or bear spray.
BottleLock® Tie-Down System
Non-slip PVC coating secures GRAYL bottles or gear under motion.
Internal Organization
Triple-zip main compartment with mesh pockets, card slots, and concealed valuables pocket.
MOLLE + Velcro Expansion
Front panel and steel O-ring accept G-Mod Velcro Pouches and other accessories.
Comfortable Fit
Heavily padded mesh lumbar belt with dual arc zip pockets; adjustable to 54 in.
Weather Protection
Water-resistant zippers and coated fabric shed rain and grit.
GRAYL
filtration systems.
Compact form factor expands from 4.5 L to 6.5 L for adaptive carry
MOLLE & Velcro integration enables rapid loadout changes
Backed by a 10-year manufacturer warranty on workmanship and materials
The numbers, flat and honest.
| Capacity | 4.5 L (274 cu in), expandable to 6.5 L (396 cu in) |
|---|---|
| Weight | 1.4 lb (631 g) |
| Dimensions | 6.75 × 12.5 × 4.75 in (17 × 32 × 12 cm) |
| Waist Belt | Fits 28–54 in (71–137 cm) |
| Material | 500D & 1000D bluesign® approved recycled coated nylon |
| Zippers | YKK Aquaguard® #5 & #8 reverse coil water-resistant |
| Warranty | 10-year workmanship and materials |
| Outer Shell | 500D & 1000D recycled coated nylon (bluesign® approved) |
| Lining | 210D HD recycled coated nylon (bluesign® approved) |
| Pockets | Dual Expanse stretch-woven, concealed zip, and mesh internal pockets |
| Hardware | YKK Aquaguard® #5 & #8 reverse coil zippers |
| Systems | BottleLock®, MOLLE & Velcro expansion panel |
| Origin | Vietnam |
| Care | Hand wash only, drip dry |
WHY YOU’RE BUYING FROM STAY READY.
We aren’t the Amazon of survival. We’re a small, opinionated shop that carries gear we’d stake our own lives on — and we back every piece with real support.
Curated
Every brand we carry has been vetted in the field by our team. If it doesn’t pass our 30-day use test, we don’t stock it.
Authenticated
Factory-direct from authorized dealers. No grey-market, no refurb, no knockoffs. Your warranty is real.
Supported
Real humans on phone, text, and email — seven days a week. We carry this gear ourselves and we stand behind it.
American
HQ in California. Orders ship from our US warehouse. US-based customer care.
PRESS-TO-PURIFY WATER BOTTLES
From a Seattle napkin sketch to the fastest, easiest portable water purifier in the world.
GRAYL started as a napkin sketch in a Seattle bar — an obsession with making the perfect portable water purifier. The first Kickstarter raised over $250,000, and today GRAYL's GeoPress and UltraPress let you press-purify water from streams, hotel sinks, wells, and lakes in seconds. The mission is straightforward: empower adventure with clean, safe water anywhere. A minimum of 1% of every sale goes to environmental charities and non-profits.
- Founded in Seattle, Washington
- Originated from a napkin sketch in a hometown Seattle bar
- Kickstarter campaign raised over $250,000
- GeoPress and UltraPress — press-to-purify in seconds
- 1% of every sale donated to environmental nonprofits
Answers, straight up.
Product-specific questions on the left. Shopping with SRO on the right. Both open-ended — hit us if we missed one.
Can it fit a GRAYL water bottle?
Yes. The Expanse BottleDrop™ Pockets and BottleLock® System are specifically engineered forGRAYLpurifiers and bottles.
How much gear does it hold?
The main compartment offers 4.5 L of storage and expands to 6.5 L with the BottleDrop™ Pockets deployed.
Is it waterproof?
It is water-resistant, constructed from coated nylon and sealed YKK Aquaguard® zippers, but not submersible.
How long does shipping take?
Most in-stock orders are processed within 1 to 3 business days, not counting weekends and federal holidays. Special-order, dealer-direct, custom, and LYNX Survival Systems orders can take longer. Lead times shown on product pages are estimates, not guarantees.
Typical carrier transit after that: Economy 5 to 7 business days, Expedited 2 to 3, Overnight 1. These are carrier estimates, not guarantees. Some items, such as lithium batteries, aerosols, and safety matches, may be limited to ground shipping.
Free Economy shipping on qualifying orders over $150 to the contiguous US, on eligible products. Oversized, heavy, freight, hazardous-material, dealer-direct, custom-built, and special-order items may be excluded. Oversized and freight items, such as rooftop tents, recovery equipment, and Pro Eagle products, may carry extra shipping charges. If extra charges apply, we'll let you know before the order ships.
Some items ship directly from the manufacturer or a supplier partner on their own schedule, so an order can arrive in more than one package with more than one tracking number. Full details: Shipping Policy.
What’s your return policy?
You have 30 days from receiving your order to request a return on eligible items. Email info@stayreadyoutdoors.com with your order number, the item, and the reason, and wait for return authorization before you ship anything back. Returns sent without authorization may be refused.
Items must come back in like-new condition: unused, unmodified, unworn, unwashed, and free of odors, dirt, stains, pet hair, and damage, with all original packaging, manuals, accessories, and tags, plus proof of purchase.
For standard parcel items, you pay return shipping unless the return is due to our error, shipping damage, or a verified defect. If we provide a prepaid label, its cost may be deducted from your refund. For oversized, freight, dealer-direct, and special-order items, you pay return shipping unless the item arrived damaged, defective, or incorrect. Original shipping charges aren't refunded. Some items may carry a restocking fee of up to 15%, and we'll tell you during authorization.
Some items are fulfilled by third-party suppliers and follow that supplier's return policy, so eligibility, refund timing, return shipping, and restocking fees may differ.
Approved refunds go to your original payment method. Allow up to 10 business days after approval, and your bank may take longer to post it. Full details: Return & Refund Policy.
What can’t I return?
These can't be returned or refunded, except where the law requires it:
- Engraved, personalized, customized, and built-to-order products, and special-order products obtained specifically for you
- LYNX Survival Systems survival kits, custom IFAKs, and custom medical kits
- Agency, government, organizational, and contract-built orders
- Gift cards, and sale or clearance items marked final sale
- Food, drink, and other perishable products, including emergency food
- Personal care, hygiene, and beauty products
- Hazardous materials, and flammable liquids or gases
- Opened or used medical products
- Opened water treatment or purification products with broken factory seals
- Anything marked non-returnable on its product page
For built-to-order, custom, and special-order items, exceptions may be made only for verified manufacturing defects, shipping damage, or fulfillment errors. For food and drink, replacements may be issued only for verified manufacturing defects or shipping damage reported within 5 days of delivery, with photos.
Not sure whether an item qualifies? Email info@stayreadyoutdoors.com before you order.
Do you ship outside the contiguous US?
Alaska, Hawaii, Puerto Rico, Guam, and other U.S. territories aren't eligible for free shipping, and extra freight charges may apply. If your order needs a shipping quote, we'll contact you before it ships. If you decline the quote, the order may be canceled and refunded. APO/FPO addresses are also excluded from free shipping.
International shipping is available on select products and destinations, and some products may be restricted from international shipping. You're responsible for import duties, taxes, customs fees, brokerage fees, and meeting your country's import rules.
Full details: Shipping Policy.
My package arrived damaged. What now?
Inspect your order when it arrives. If anything is damaged, defective, or wrong, email info@stayreadyoutdoors.com within 7 days of delivery (5 days for food and drink) with your order number, a short description, and photos of the item and the packaging.
You don't pay return shipping on items that arrived damaged or wrong, or with a verified defect. Some items fulfilled by third-party suppliers follow that supplier's policy instead. Reporting after 7 days may limit our ability to pursue a claim with the carrier, and while we may help with a carrier claim, approval is up to the carrier.
Package lost or never arrived? Contact us within 7 days of the expected delivery date. For freight deliveries, inspect the shipment before you sign and note any visible damage on the carrier's delivery receipt.
Can I talk to a human before buying?
Yes. Call (562) 294-6269, Monday to Friday, 8:00 AM to 4:00 PM Pacific time, or email info@stayreadyoutdoors.com. We reply within one business day.
We'd rather talk you out of a kit that doesn't fit your mission than sell you the wrong one.
Do you offer a military/first-responder discount?
Yes. Current and former U.S. military, military spouses and dependents, and first responders, including law enforcement, fire, and EMS, can save up to 10% on most of our products through GovX ID.
Verify on our GovX discount page and you'll get a single-use code to enter at checkout. For later orders, log in with GovX ID for a new code (limit one code per day). The GovX code can't be combined with other discounts.