XCPaperboxCustom Packaging

500+ units · Sample 5–7 business days · Production 10–15 business days after sample approval

Custom SOS Paper Bags

SOS (Self-Opening Sack) bags for food service and grocery. The block-bottom bag that stands on its own.

Quick answer

Custom SOS (Self-Opening Sack) paper bags are block-bottom grocery and food service bags with a flat handle. Stand on their own, open automatically when loaded. MOQ from 500 units, lead time 10–15 business days after sample approval.

Need pricing? Get a quote in 24 hours.

Custom SOS Paper Bags — premium custom packaging with luxury finish
Custom SOS Paper Bags — interior view and craftsmanship details
Custom SOS Paper Bags — interior view and craftsmanship details

MOQ

500 units

Sample

5–7 business days

Lead time

10–15 business days

Category

Bags

Format

SOS Paper Bags

Why order direct from XC Paperbox

  • Foshan factory

    18,000 m² since 2018

  • FSC A000511

    Certified paper sourcing

  • ISO 9001:2015

    Quality management

  • 1M+ boxes / year

    Volume capacity

  • DDP to 50+ countries

    No surprise customs

  • 24-hour quote

    Reply within 1 business day

Overview

What it is, and when to use it.

Custom SOS (Self-Opening Sack) paper bags are block-bottom bags with a flat handle, designed to stand on their own and open automatically when loaded. The block-bottom creates a flat base that sits stable on a counter or shelf, and the bag opens automatically when the first item is loaded — no manual erection required. SOS bags are the grocery standard (the bag at the end of the checkout) and the food service standard (takeaway, bakery, deli). They are built from 100–200 gsm kraft paper (brown or white) with a flat paper handle, and they ship flat to save freight volume. SOS bags are the most cost-effective carrier in our catalog at high volume — at 10,000+ units, the per-unit cost is the lowest of any bag format. We manufacture SOS bags from 500 units, with white samples in 5–7 business days and printed samples in 7–10 days. Every project runs on a dedicated line in our 18,000 m² FSC-certified facility in Foshan, China.

Best for

  • Grocery & supermarket
  • Food service & takeaway
  • Bakery & deli
  • Farmers market
  • Liquor store
  • High-volume carry-out

Buyer's decision framework

When to choose SOS paper bags

SOS construction is the right answer when the bag needs to stand on its own, open automatically when loaded, and carry grocery or food service at the lowest cost-per-bag. The format is the workhorse of grocery and food service.

  1. 1

    Does the bag need to stand on its own (grocery checkout, food service counter)?

    Yes — SOS bags are the format when the bag must stand stable on a counter or shelf. The block-bottom creates a flat base. If the bag is carried immediately (no counter stand), flat handle bags (non-SOS) or twisted handle bags are sufficient.

  2. 2

    Does the bag need to open automatically when loaded (grocery checkout speed)?

    Yes — SOS bags open automatically when the first item is loaded. This is why SOS is the grocery checkout standard — the cashier can load groceries with one hand. If the bag is opened manually (retail, restaurant), flat handle bags are sufficient.

  3. 3

    Is the per-unit cost the primary constraint (high-volume grocery)?

    Yes — SOS bags are the lowest-cost carrier in our catalog at high volume. At 10,000+ units, SOS flexo-printed bags are the lowest per-unit cost in the carrier family. If the bag is lower-volume (under 1,000 units), flat handle or twisted handle bags are more cost-effective.

  4. 4

    Food-grade or standard kraft?

    Food-grade (grease-resistant) for direct food contact (takeaway, bakery, deli, fried food). Standard kraft for non-food grocery (cleaning products, packaged goods). Always specify food-grade when ordering for food applications — the grease-resistant treatment adds a minimal per-unit cost.

This page

SOS (Kraft, Food-Grade)

Grocery, takeaway, bakery, deli

Cost
$
Lead
10–15 days
MOQ
500

Alternative

SOS (Kraft, Grocery)

Grocery, produce, liquor

Cost
$
Lead
10–15 days
MOQ
500

Alternative

Flat Handle (Non-SOS)

Retail, restaurant, cost-down carry

Cost
$
Lead
10–15 days
MOQ
500

Applications

Common use cases

  • Grocery & supermarket checkout
  • Food service & takeaway
  • Bakery & deli
  • Farmers market & produce
  • Liquor store & bottle shop
  • High-volume carry-out (any retail)
  • Restaurant delivery
  • Specialty food (oil, sauce, spice)

Materials

Board & paper options

  • 100–200 gsm kraft paper (brown or white)The standard for SOS bags. Brown kraft for grocery and eco positioning; white kraft for brighter print and food presentation. 150 gsm is the sweet spot for most SOS bags.
  • Grease-resistant kraft paper (food-grade)Required for direct food contact (takeaway, bakery, fried food, deli). Grease-resistant treatment prevents oil soak-through. FDA-compliant for direct food contact.
  • Recycled kraft paper (100% post-consumer)For eco-positioned brands and grocery. Slightly lower print quality but supports the eco story. FSC-certified available.
  • FSC-certified kraft paperRequired if your brand makes a sustainability claim. We hold FSC license A000511 and supply chain-of-custody documentation.
  • Flat paper handle (attached)The standard handle for SOS bags. A flat paper strip glued to the inside of the bag top. Supports 2–3 kg loads (grocery, food, produce).
  • Block-bottom construction (SOS)The defining feature of SOS bags. The bottom is folded and glued into a block shape that creates a flat base — the bag stands on its own and opens automatically when loaded.

Printing & finishes

How it gets dressed

Printing

  • Flexo print (direct)Recommended for high-volume grocery and food service (5,000+ units). Lowest cost for simple line art, logos, and single-color branding on bare kraft.
  • Offset CMYKRecommended for 1,000+ units and full-color photographic artwork. Lower per-unit cost at volume for premium branded grocery.
  • Digital printRecommended for 500–1,000 unit runs. No plate setup, fast turnaround, ideal for market tests and brand launches.
  • Pantone spot colorsRecommended for brand-critical color matches (logo reds, brand blues) where CMYK cannot reproduce a corporate color.
  • Metallic inksRecommended for shimmer effects without foil-stamp cost. Subtler than foil, good for backgrounds and patterns.
  • No print (bare kraft)Recommended for grocery and eco positioning. The natural kraft is the finish. Lowest cost and strongest eco statement.

Finishes

  • Grease-resistant treatment (food-grade)
  • Aqueous coating (eco, water-based)
  • Matte or gloss lamination (coated paper only)
  • Foil stamping (coated paper only)
  • Flat paper handle (attached)
  • Reinforced handle attachment
  • Block-bottom (SOS standard)
  • Side gusset (for volume)

Sizes

Standard sizes — and fully custom

LabelWDHUnit
Small (bakery)15090220mm
Medium (grocery)280170380mm
Large (bulk grocery)380220450mm
XL (liquor)450260500mm
Custommm

Ordering & pricing

MOQ, lead time, and what drives the unit cost.

Every bag is custom — there is no flat price list. Here is what you need to plan around, and what we will confirm in your tailored quote within 24 hours.

MOQ & sampling

MOQ is 500 units per SKU. We can run smaller quantities as a sample or pilot program — ask us.

Lead time

Standard lead time is 10–15 business days after sample approval — the fastest in our bag catalog. Flexo-printed bags run faster (10–15 days). For grocery chain launches, book 6–8 weeks ahead. Air freight (5–7 days) and sea freight (28–35 days) are both available.

How to read pricing

Final pricing is confirmed in your tailored quote within 24 hours. We do not publish a flat price list because every SOS bag is custom — but we will always show the unit cost at 500, 1,000, 5,000, 10,000, and 50,000 units so you can see the volume curve before committing.

What affects the unit cost

Seven factors that move the quote.

  • Paper type

    Kraft adds a small per-unit cost at 5,000 (standard). Recycled kraft adds 10–20%. Coated art paper adds a modest per-unit cost at 1,000 (premium grocery).

  • Grease-resistant treatment

    Grease-resistant kraft adds a minimal per-unit cost. Required for direct food contact. FDA-compliant.

  • Paper weight

    100 gsm for small food bags. 150 gsm standard. 200 gsm for grocery and heavy loads. Higher weight = stronger bag but higher cost.

  • Handle attachment

    Standard glued flat handle no additional cost. Reinforced handle attachment (stapled or double-glued) adds a minimal per-unit cost for heavy grocery loads.

  • Print method

    Flexo for 5,000+ units (lowest cost). Offset for 1,000+ units. Digital for 500–1,000 units. No print (bare kraft) for the strongest eco positioning and lowest cost.

  • Construction

    SOS (block-bottom) is the standard format — no additional cost. Side gusset adds a minimal per-unit cost for added volume. Cardboard divider for bottle bags adds a small per-unit cost.

  • Volume

    Per-unit cost drops sharply from 500 → 5,000 → 10,000 units, then gradually to 50,000. At 10,000+ units SOS flexo-printed bags are the lowest-cost carrier in the catalog.

Real project

A grocery chain's checkout bag program

Custom SOS Paper Bags real project example
Client
Grocery chain (representative example)
Challenge
A grocery chain needed a checkout bag for 50 stores that would stand on the checkout counter, open automatically for one-handed loading, carry 4 kg of groceries, print the chain logo, and stay within a minimal per-bag budget at 50,000 units.
Format chosen
SOS bag in 150 gsm brown kraft, 280×170×380mm. Flexo single-color print (chain logo). Standard SOS block-bottom. Reinforced glued handle attachment for 4 kg load. Side gusset for grocery volume. No grease-resistant treatment (non-food grocery).
Result
The SOS block-bottom stood stable on the checkout counter and opened automatically for one-handed loading, increasing checkout speed. The flexo single-color print delivered chain branding at the lowest per-unit cost. The format scaled from 10,000-unit pilot to 50,000-unit chain-wide rollout at a per-unit cost that met the chain's checkout budget target.

Frequently asked

Questions about custom sos paper bags.

Don't see your question?

Browse our FAQ center

500 units.

Our standard MOQ for custom SOS bags is 500 units per SKU. At 500 units we use flexo print. From 5,000 units, the per-unit cost drops sharply. For high-volume grocery chains, we run 50,000+ unit orders at the lowest per-unit cost in our bag catalog.

SOS is a specific block-bottom format that stands on its own; flat handle describes the handle type across formats.

SOS (Self-Opening Sack) is a specific bag format — a block-bottom bag with a flat handle that stands on its own and opens automatically when loaded. Flat handle describes the handle type (flat paper strip) and can be applied to multiple bag formats (SOS, pinch-bottom, flat-bottom). All SOS bags have flat handles; not all flat handle bags are SOS. If you want the grocery standard, ask for "SOS bags".

The bag opens automatically when the first item is loaded — no manual erection required.

SOS (Self-Opening Sack) means the bag opens automatically when the first item is loaded into it. The block-bottom construction creates a flat base that sits stable on a counter, and the bag mouth pops open when the first item is placed inside — no manual erection or opening required. This is why SOS bags are the grocery checkout standard — the cashier can load groceries with one hand without fumbling to open the bag.

Yes — with grease-resistant kraft paper for direct food contact.

SOS bags are food-safe with grease-resistant kraft paper. The grease-resistant treatment prevents oil soak-through from fried food, bakery, deli, and takeaway. FDA-compliant for direct food contact. For non-food grocery (cleaning products, packaged goods), standard kraft (non-grease-resistant) is sufficient and lower cost. Always specify food-grade when ordering for food applications.

Yes — SOS bags with reinforced bottoms carry 1–2 bottles securely.

SOS bags are the standard format for liquor store and wine bottle carrying. The block-bottom creates a stable base for bottles, and the flat handle supports 2–3 kg (1–2 bottles). For single-bottle bags, choose a narrow SOS format (150×90×350mm). For two-bottle bags, choose a wider format (260×140×350mm) with a cardboard divider to prevent clinking. Always specify the bottle diameter when ordering.

Yes — 7–10 business days for a printed sample, 5–7 for a white sample.

We provide white samples (unprinted, exact construction) in 5–7 business days and printed samples (your artwork, finish, and color) in 7–10 business days. Sample fees are credited back against your production order. For SOS bags, the white sample confirms the block-bottom construction, the handle attachment, and the bag stability.

Yes — kraft paper and flat paper handles are fully recyclable in standard paper streams.

Kraft paper and flat paper handles are fully recyclable in standard paper streams — the consumer recycles the entire bag without disassembly. If you choose coated art paper with lamination, recyclability is reduced. For eco-positioned brands, choose kraft paper, water-based ink, and skip lamination. We supply chain-of-custody documentation for all FSC-certified projects.

10–15 business days after sample approval.

Standard production runs 10–15 business days after sample approval — the fastest lead time in our bag catalog because SOS bags are fully machine-converted with minimal hand labor. Flexo-printed bags run faster (10–15 days). Offset and digital print bags run 10–15 days. Air freight (5–7 days) and sea freight (28–35 days) are both available. For grocery chain launches, book 6–8 weeks ahead.

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